56217020721 has 8 divisors (see below), whose sum is σ = 75389300160. Its totient is φ = 37261377552.

The previous prime is 56217020701. The next prime is 56217020747. The reversal of 56217020721 is 12702071265.

56217020721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 56217020721 - 2¹⁰ = 56217019697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56217020701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54158461 + ... + 54159498.

It is an arithmetic number, because the mean of its divisors is an integer number (9423662520).

Almost surely, 2^56217020721 is an apocalyptic number.

It is an amenable number.

56217020721 is a deficient number, since it is larger than the sum of its proper divisors (19172279439).

56217020721 is a wasteful number, since it uses less digits than its factorization.

56217020721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108318135.

The product of its (nonzero) digits is 11760, while the sum is 33.

Adding to 56217020721 its reverse (12702071265), we get a palindrome (68919091986).

The spelling of 56217020721 in words is "fifty-six billion, two hundred seventeen million, twenty thousand, seven hundred twenty-one".