1222021200 has 240 divisors, whose sum is σ = 4259459520. Its totient is φ = 298229760.

The previous prime is 1222021189. The next prime is 1222021219. The reversal of 1222021200 is 21202221.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 753991 + ... + 755609.

It is an arithmetic number, because the mean of its divisors is an integer number (17747748).

Almost surely, 2^1222021200 is an apocalyptic number.

1222021200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1222021200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2129729760).

1222021200 is an abundant number, since it is smaller than the sum of its proper divisors (3037438320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1222021200 is a wasteful number, since it uses less digits than its factorization.

1222021200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694 (or 1683 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 1222021200 is about 34957.4198132528. The cubic root of 1222021200 is about 1069.1194899048.

Adding to 1222021200 its reverse (21202221), we get a palindrome (1243223421).

It can be divided in two parts, 1222021 and 200, that added together give a palindrome (1222221).

The spelling of 1222021200 in words is "one billion, two hundred twenty-two million, twenty-one thousand, two hundred".