21958130256 has 80 divisors (see below), whose sum is σ = 58083157440. Its totient is φ = 7144381440.

The previous prime is 21958130239. The next prime is 21958130287. The reversal of 21958130256 is 65203185912.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4416540 + ... + 4421508.

It is an arithmetic number, because the mean of its divisors is an integer number (726039468).

Almost surely, 2^21958130256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21958130256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29041578720).

21958130256 is an abundant number, since it is smaller than the sum of its proper divisors (36125027184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21958130256 is a wasteful number, since it uses less digits than its factorization.

21958130256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7164 (or 7158 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 42.

The spelling of 21958130256 in words is "twenty-one billion, nine hundred fifty-eight million, one hundred thirty thousand, two hundred fifty-six".