56506021 has 8 divisors (see below), whose sum is σ = 66384864. Its totient is φ = 47417520.

The previous prime is 56506001. The next prime is 56506031. The reversal of 56506021 is 12060565.

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 56506021 - 2¹⁵ = 56473253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56506001) 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, 197431 + ... + 197716.

It is an arithmetic number, because the mean of its divisors is an integer number (8298108).

Almost surely, 2^56506021 is an apocalyptic number.

It is an amenable number.

56506021 is a deficient number, since it is larger than the sum of its proper divisors (9878843).

56506021 is a wasteful number, since it uses less digits than its factorization.

56506021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395171.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 56506021 is about 7517.0486894791. The cubic root of 56506021 is about 383.7351440595.

Adding to 56506021 its reverse (12060565), we get a palindrome (68566586).

The spelling of 56506021 in words is "fifty-six million, five hundred six thousand, twenty-one".