1221300 has 108 divisors (see below), whose sum is σ = 4062240. Its totient is φ = 306240.

The previous prime is 1221299. The next prime is 1221373. The reversal of 1221300 is 31221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 20671 + ... + 20729.

2^1221300 is an apocalyptic number.

1221300 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 1221300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2031120).

1221300 is an abundant number, since it is smaller than the sum of its proper divisors (2840940).

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

1221300 is a wasteful number, since it uses less digits than its factorization.

1221300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102 (or 92 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 1221300 is about 1105.1244273836. The cubic root of 1221300 is about 106.8909127840.

Adding to 1221300 its reverse (31221), we get a palindrome (1252521).

It can be divided in two parts, 1221 and 300, that added together give a square (1521 = 39²).

The spelling of 1221300 in words is "one million, two hundred twenty-one thousand, three hundred".