56033721 has 8 divisors (see below), whose sum is σ = 83012960. Its totient is φ = 37355796.

The previous prime is 56033707. The next prime is 56033743. The reversal of 56033721 is 12733065.

It is a happy number.

56033721 is a `hidden beast` number, since 5 + 603 + 37 + 21 = 666.

56033721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-56033721 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2075323 = 56033721 / (5 + 6 + 0 + 3 + 3 + 7 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56033321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1037635 + ... + 1037688.

It is an arithmetic number, because the mean of its divisors is an integer number (10376620).

Almost surely, 2^56033721 is an apocalyptic number.

It is an amenable number.

56033721 is a deficient number, since it is larger than the sum of its proper divisors (26979239).

56033721 is a wasteful number, since it uses less digits than its factorization.

56033721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2075332 (or 2075326 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 27.

The square root of 56033721 is about 7485.5675135557. The cubic root of 56033721 is about 382.6630139463.

Adding to 56033721 its reverse (12733065), we get a palindrome (68766786).

The spelling of 56033721 in words is "fifty-six million, thirty-three thousand, seven hundred twenty-one".