56032221 has 64 divisors (see below), whose sum is σ = 95993856. Its totient is φ = 28339200.

The previous prime is 56032219. The next prime is 56032267. The reversal of 56032221 is 12223065.

It is not a de Polignac number, because 56032221 - 2¹ = 56032219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56032271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 675046 + ... + 675128.

It is an arithmetic number, because the mean of its divisors is an integer number (1499904).

Almost surely, 2^56032221 is an apocalyptic number.

56032221 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

56032221 is a deficient number, since it is larger than the sum of its proper divisors (39961635).

56032221 is a wasteful number, since it uses less digits than its factorization.

56032221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 56032221 is about 7485.4673200810. The cubic root of 56032221 is about 382.6595993379.

Adding to 56032221 its reverse (12223065), we get a palindrome (68255286).

The spelling of 56032221 in words is "fifty-six million, thirty-two thousand, two hundred twenty-one".