56221512 has 32 divisors (see below), whose sum is σ = 141588000. Its totient is φ = 18602624.

The previous prime is 56221481. The next prime is 56221519. The reversal of 56221512 is 21512265.

It is a happy number.

It is a super-2 number, since 2×56221512² = 6321716823132288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (56221519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5262 + ... + 11837.

It is an arithmetic number, because the mean of its divisors is an integer number (4424625).

Almost surely, 2^56221512 is an apocalyptic number.

It is an amenable number.

56221512 is an abundant number, since it is smaller than the sum of its proper divisors (85366488).

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

56221512 is a wasteful number, since it uses less digits than its factorization.

56221512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17245 (or 17241 counting only the distinct ones).

The product of its digits is 1200, while the sum is 24.

The square root of 56221512 is about 7498.1005594750. The cubic root of 56221512 is about 383.0900219463.

Adding to 56221512 its reverse (21512265), we get a palindrome (77733777).

The spelling of 56221512 in words is "fifty-six million, two hundred twenty-one thousand, five hundred twelve".