56021 has 8 divisors (see below), whose sum is σ = 65664. Its totient is φ = 46800.

The previous prime is 56009. The next prime is 56039. The reversal of 56021 is 12065.

56021 = T₁₂₃ + T₁₂₄ + ... + T₁₂₉.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56021 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 55987 and 56005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56041) 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, 296 + ... + 446.

It is an arithmetic number, because the mean of its divisors is an integer number (8208).

2⁵⁶⁰²¹ is an apocalyptic number.

It is an amenable number.

56021 is a deficient number, since it is larger than the sum of its proper divisors (9643).

56021 is a wasteful number, since it uses less digits than its factorization.

56021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211.

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

The square root of 56021 is about 236.6875577634. The cubic root of 56021 is about 38.2634053857.

Adding to 56021 its reverse (12065), we get a palindrome (68086).

Subtracting from 56021 its reverse (12065), we obtain a triangular number (43956 = T₂₉₆).

The spelling of 56021 in words is "fifty-six thousand, twenty-one".