9956056021 has 2 divisors, whose sum is σ = 9956056022. Its totient is φ = 9956056020.

The previous prime is 9956055959. The next prime is 9956056037. The reversal of 9956056021 is 1206506599.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8994435921 + 961620100 = 94839^2 + 31010^2 .

It is a cyclic number.

It is not a de Polignac number, because 9956056021 - 2³³ = 1366121429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9956056321) 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 as a sum of consecutive naturals, namely, 4978028010 + 4978028011.

It is an arithmetic number, because the mean of its divisors is an integer number (4978028011).

Almost surely, 2^9956056021 is an apocalyptic number.

It is an amenable number.

9956056021 is a deficient number, since it is larger than the sum of its proper divisors (1).

9956056021 is an equidigital number, since it uses as much as digits as its factorization.

9956056021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145800, while the sum is 43.

The square root of 9956056021 is about 99780.0381890085. The cubic root of 9956056021 is about 2151.2742416527.

The spelling of 9956056021 in words is "nine billion, nine hundred fifty-six million, fifty-six thousand, twenty-one".