56000021 has 8 divisors (see below), whose sum is σ = 69818304. Its totient is φ = 43636320.

The previous prime is 56000003. The next prime is 56000029. The reversal of 56000021 is 12000065.

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

It is not a de Polignac number, because 56000021 - 2¹⁴ = 55983637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56000029) 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, 363560 + ... + 363713.

It is an arithmetic number, because the mean of its divisors is an integer number (8727288).

Almost surely, 2^56000021 is an apocalyptic number.

It is an amenable number.

56000021 is a deficient number, since it is larger than the sum of its proper divisors (13818283).

56000021 is a wasteful number, since it uses less digits than its factorization.

56000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727291.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 56000021 is about 7483.3161766693. The cubic root of 56000021 is about 382.5862843778.

Adding to 56000021 its reverse (12000065), we get a palindrome (68000086).

The spelling of 56000021 in words is "fifty-six million, twenty-one", and thus it is an aban number and an uban number.