256198982221 has 48 divisors (see below), whose sum is σ = 334954416000. Its totient is φ = 191340175104.

The previous prime is 256198982219. The next prime is 256198982251. The reversal of 256198982221 is 122289891652.

It is not a de Polignac number, because 256198982221 - 2¹ = 256198982219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256198982201) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6205555 + ... + 6246703.

It is an arithmetic number, because the mean of its divisors is an integer number (6978217000).

Almost surely, 2^256198982221 is an apocalyptic number.

It is an amenable number.

256198982221 is a deficient number, since it is larger than the sum of its proper divisors (78755433779).

256198982221 is a wasteful number, since it uses less digits than its factorization.

256198982221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41478 (or 41465 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 55.

The spelling of 256198982221 in words is "two hundred fifty-six billion, one hundred ninety-eight million, nine hundred eighty-two thousand, two hundred twenty-one".