21574920156 has 48 divisors (see below), whose sum is σ = 52196390400. Its totient is φ = 6927786432.

The previous prime is 21574920149. The next prime is 21574920163. The reversal of 21574920156 is 65102947512.

It is an interprime number because it is at equal distance from previous prime (21574920149) and next prime (21574920163).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82161 + ... + 223383.

It is an arithmetic number, because the mean of its divisors is an integer number (1087424800).

Almost surely, 2^21574920156 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 21574920156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26098195200).

21574920156 is an abundant number, since it is smaller than the sum of its proper divisors (30621470244).

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

21574920156 is a wasteful number, since it uses less digits than its factorization.

21574920156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141698 (or 141696 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 42.

The spelling of 21574920156 in words is "twenty-one billion, five hundred seventy-four million, nine hundred twenty thousand, one hundred fifty-six".