21921835468 has 24 divisors (see below), whose sum is σ = 41880183968. Its totient is φ = 9979168896.

The previous prime is 21921835399. The next prime is 21921835471. The reversal of 21921835468 is 86453812912.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2883696 + ... + 2891287.

Almost surely, 2^21921835468 is an apocalyptic number.

It is an amenable number.

21921835468 is a deficient number, since it is larger than the sum of its proper divisors (19958348500).

21921835468 is a wasteful number, since it uses less digits than its factorization.

21921835468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5775073 (or 5775071 counting only the distinct ones).

The product of its digits is 829440, while the sum is 49.

The spelling of 21921835468 in words is "twenty-one billion, nine hundred twenty-one million, eight hundred thirty-five thousand, four hundred sixty-eight".