1222211000 has 64 divisors (see below), whose sum is σ = 2865451680. Its totient is φ = 487948800.

The previous prime is 1222210993. The next prime is 1222211017. The reversal of 1222211000 is 1122221.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 786224 + ... + 787776.

Almost surely, 2^1222211000 is an apocalyptic number.

1222211000 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 1222211000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1432725840).

1222211000 is an abundant number, since it is smaller than the sum of its proper divisors (1643240680).

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

1222211000 is a wasteful number, since it uses less digits than its factorization.

1222211000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2361 (or 2347 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1222211000 is about 34960.1344391008. The cubic root of 1222211000 is about 1069.1748376556.

Adding to 1222211000 its reverse (1122221), we get a palindrome (1223333221).

It can be divided in two parts, 122 and 2211000, that added together give a palindrome (2211122).

The spelling of 1222211000 in words is "one billion, two hundred twenty-two million, two hundred eleven thousand".