21156957282 has 8 divisors (see below), whose sum is σ = 42313914576. Its totient is φ = 7052319092.

The previous prime is 21156957257. The next prime is 21156957293. The reversal of 21156957282 is 28275965112.

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

21156957282 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1763079768 + ... + 1763079779.

It is an arithmetic number, because the mean of its divisors is an integer number (5289239322).

Almost surely, 2^21156957282 is an apocalyptic number.

21156957282 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21156957282 is a wasteful number, since it uses less digits than its factorization.

21156957282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3526159552.

The product of its digits is 604800, while the sum is 48.

The spelling of 21156957282 in words is "twenty-one billion, one hundred fifty-six million, nine hundred fifty-seven thousand, two hundred eighty-two".