56407021 has 16 divisors (see below), whose sum is σ = 63475776. Its totient is φ = 49680000.

The previous prime is 56407019. The next prime is 56407061. The reversal of 56407021 is 12070465.

It is a cyclic number.

It is not a de Polignac number, because 56407021 - 2¹ = 56407019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56407061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81286 + ... + 81976.

It is an arithmetic number, because the mean of its divisors is an integer number (3967236).

Almost surely, 2^56407021 is an apocalyptic number.

It is an amenable number.

56407021 is a deficient number, since it is larger than the sum of its proper divisors (7068755).

56407021 is a wasteful number, since it uses less digits than its factorization.

56407021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 56407021 is about 7510.4607714840. The cubic root of 56407021 is about 383.5109084437.

Adding to 56407021 its reverse (12070465), we get a palindrome (68477486).

The spelling of 56407021 in words is "fifty-six million, four hundred seven thousand, twenty-one".