21699447307376 has 20 divisors (see below), whose sum is σ = 43178967785112. Its totient is φ = 10556487878976.

The previous prime is 21699447307361. The next prime is 21699447307381. The reversal of 21699447307376 is 67370374499612.

It is a congruent 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, 18327235310 + ... + 18327236493.

Almost surely, 2^{21699447307376} is an apocalyptic number.

It is an amenable number.

21699447307376 is a deficient number, since it is larger than the sum of its proper divisors (21479520477736).

21699447307376 is a wasteful number, since it uses less digits than its factorization.

21699447307376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36654471848 (or 36654471842 counting only the distinct ones).

The product of its (nonzero) digits is 288054144, while the sum is 68.

The spelling of 21699447307376 in words is "twenty-one trillion, six hundred ninety-nine billion, four hundred forty-seven million, three hundred seven thousand, three hundred seventy-six".