56115021 has 8 divisors (see below), whose sum is σ = 75142080. Its totient is φ = 37248992.

The previous prime is 56115013. The next prime is 56115047. The reversal of 56115021 is 12051165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56115021 - 2³ = 56115013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56115001) 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, 39441 + ... + 40838.

It is an arithmetic number, because the mean of its divisors is an integer number (9392760).

Almost surely, 2^56115021 is an apocalyptic number.

It is an amenable number.

56115021 is a deficient number, since it is larger than the sum of its proper divisors (19027059).

56115021 is a wasteful number, since it uses less digits than its factorization.

56115021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80515.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 56115021 is about 7490.9959951932. The cubic root of 56115021 is about 382.8479946352.

Adding to 56115021 its reverse (12051165), we get a palindrome (68166186).

The spelling of 56115021 in words is "fifty-six million, one hundred fifteen thousand, twenty-one".