21702218337 has 12 divisors (see below), whose sum is σ = 31789165824. Its totient is φ = 14264368440.

The previous prime is 21702218333. The next prime is 21702218341. The reversal of 21702218337 is 73381220712.

It is an interprime number because it is at equal distance from previous prime (21702218333) and next prime (21702218341).

It is not a de Polignac number, because 21702218337 - 2² = 21702218333 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21702218333) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16980753 + ... + 16982030.

It is an arithmetic number, because the mean of its divisors is an integer number (2649097152).

Almost surely, 2^21702218337 is an apocalyptic number.

It is an amenable number.

21702218337 is a deficient number, since it is larger than the sum of its proper divisors (10086947487).

21702218337 is a wasteful number, since it uses less digits than its factorization.

21702218337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33962860 (or 33962857 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The spelling of 21702218337 in words is "twenty-one billion, seven hundred two million, two hundred eighteen thousand, three hundred thirty-seven".