56120017221 has 6 divisors (see below), whose sum is σ = 81062247110. Its totient is φ = 37413344808.

The previous prime is 56120017201. The next prime is 56120017231. The reversal of 56120017221 is 12271002165.

It can be written as a sum of positive squares in only one way, i.e., 53312501025 + 2807516196 = 230895^2 + 52986^2 .

It is not a de Polignac number, because 56120017221 - 2⁶ = 56120017157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56120017201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3117778726 + ... + 3117778743.

Almost surely, 2^56120017221 is an apocalyptic number.

It is an amenable number.

56120017221 is a deficient number, since it is larger than the sum of its proper divisors (24942229889).

56120017221 is a wasteful number, since it uses less digits than its factorization.

56120017221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6235557475 (or 6235557472 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

Adding to 56120017221 its reverse (12271002165), we get a palindrome (68391019386).

The spelling of 56120017221 in words is "fifty-six billion, one hundred twenty million, seventeen thousand, two hundred twenty-one".