56101221 has 32 divisors (see below), whose sum is σ = 92620800. Its totient is φ = 33269040.

The previous prime is 56101219. The next prime is 56101237. The reversal of 56101221 is 12210165.

It is not a de Polignac number, because 56101221 - 2¹ = 56101219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 56101194 and 56101203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56101291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11950 + ... + 15968.

It is an arithmetic number, because the mean of its divisors is an integer number (2894400).

Almost surely, 2^56101221 is an apocalyptic number.

It is an amenable number.

56101221 is a deficient number, since it is larger than the sum of its proper divisors (36519579).

56101221 is a wasteful number, since it uses less digits than its factorization.

56101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4086 (or 4080 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 56101221 is about 7490.0748327370. The cubic root of 56101221 is about 382.8166082947.

Adding to 56101221 its reverse (12210165), we get a palindrome (68311386).

The spelling of 56101221 in words is "fifty-six million, one hundred one thousand, two hundred twenty-one".