21017722476 has 48 divisors (see below), whose sum is σ = 49909910400. Its totient is φ = 6882772992.

The previous prime is 21017722471. The next prime is 21017722493. The reversal of 21017722476 is 67422771012.

It is not an unprimeable number, because it can be changed into a prime (21017722471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119340 + ... + 237228.

It is an arithmetic number, because the mean of its divisors is an integer number (1039789800).

Almost surely, 2^21017722476 is an apocalyptic number.

It is an amenable number.

21017722476 is an abundant number, since it is smaller than the sum of its proper divisors (28892187924).

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

21017722476 is a wasteful number, since it uses less digits than its factorization.

21017722476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118158 (or 118156 counting only the distinct ones).

The product of its (nonzero) digits is 65856, while the sum is 39.

The spelling of 21017722476 in words is "twenty-one billion, seventeen million, seven hundred twenty-two thousand, four hundred seventy-six".