56817349021 has 2 divisors, whose sum is σ = 56817349022. Its totient is φ = 56817349020.

The previous prime is 56817349007. The next prime is 56817349091. The reversal of 56817349021 is 12094371865.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46133025796 + 10684323225 = 214786^2 + 103365^2 .

It is a cyclic number.

It is not a de Polignac number, because 56817349021 - 2⁷ = 56817348893 is a prime.

It is a super-2 number, since 2×56817349021² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56817349091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28408674510 + 28408674511.

It is an arithmetic number, because the mean of its divisors is an integer number (28408674511).

It is a 1-persistent number, because it is pandigital, but 2⋅56817349021 = 113634698042 is not.

Almost surely, 2^56817349021 is an apocalyptic number.

It is an amenable number.

56817349021 is a deficient number, since it is larger than the sum of its proper divisors (1).

56817349021 is an equidigital number, since it uses as much as digits as its factorization.

56817349021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 56817349021 in words is "fifty-six billion, eight hundred seventeen million, three hundred forty-nine thousand, twenty-one".