1221125304 has 64 divisors (see below), whose sum is σ = 3574045440. Its totient is φ = 340381440.

The previous prime is 1221125303. The next prime is 1221125333. The reversal of 1221125304 is 4035211221.

It is a super-2 number, since 2×1221125304² = 2982294016138184832, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221125303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81754 + ... + 95529.

It is an arithmetic number, because the mean of its divisors is an integer number (55844460).

Almost surely, 2^1221125304 is an apocalyptic number.

1221125304 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1221125304 is an abundant number, since it is smaller than the sum of its proper divisors (2352920136).

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

1221125304 is a wasteful number, since it uses less digits than its factorization.

1221125304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177340 (or 177336 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1221125304 is about 34944.6033601757. The cubic root of 1221125304 is about 1068.8581594583.

Adding to 1221125304 its reverse (4035211221), we get a palindrome (5256336525).

The spelling of 1221125304 in words is "one billion, two hundred twenty-one million, one hundred twenty-five thousand, three hundred four".