56100021 has 4 divisors (see below), whose sum is σ = 74800032. Its totient is φ = 37400012.

The previous prime is 56099977. The next prime is 56100041. The reversal of 56100021 is 12000165.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56100021 - 2⁶ = 56099957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56100041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9350001 + ... + 9350006.

It is an arithmetic number, because the mean of its divisors is an integer number (18700008).

Almost surely, 2^56100021 is an apocalyptic number.

It is an amenable number.

56100021 is a deficient number, since it is larger than the sum of its proper divisors (18700011).

56100021 is a wasteful number, since it uses less digits than its factorization.

56100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18700010.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 56100021 is about 7489.9947262999. The cubic root of 56100021 is about 382.8138788044.

Adding to 56100021 its reverse (12000165), we get a palindrome (68100186).

The spelling of 56100021 in words is "fifty-six million, one hundred thousand, twenty-one".