21312693998 has 16 divisors (see below), whose sum is σ = 33016135680. Its totient is φ = 10307645400.

The previous prime is 21312693947. The next prime is 21312694001. The reversal of 21312693998 is 89939621312.

It is a congruent number.

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, 49463 + ... + 212301.

It is an arithmetic number, because the mean of its divisors is an integer number (2063508480).

Almost surely, 2^21312693998 is an apocalyptic number.

21312693998 is a deficient number, since it is larger than the sum of its proper divisors (11703441682).

21312693998 is a wasteful number, since it uses less digits than its factorization.

21312693998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164983.

The product of its digits is 1259712, while the sum is 53.

The spelling of 21312693998 in words is "twenty-one billion, three hundred twelve million, six hundred ninety-three thousand, nine hundred ninety-eight".