21993645104 has 20 divisors (see below), whose sum is σ = 42672811920. Its totient is φ = 10981306560.

The previous prime is 21993645077. The next prime is 21993645131. The reversal of 21993645104 is 40154639912.

It is an interprime number because it is at equal distance from previous prime (21993645077) and next prime (21993645131).

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, 958052 + ... + 980739.

It is an arithmetic number, because the mean of its divisors is an integer number (2133640596).

Almost surely, 2^21993645104 is an apocalyptic number.

It is an amenable number.

21993645104 is a deficient number, since it is larger than the sum of its proper divisors (20679166816).

21993645104 is a wasteful number, since it uses less digits than its factorization.

21993645104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1939508 (or 1939502 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 44.

The spelling of 21993645104 in words is "twenty-one billion, nine hundred ninety-three million, six hundred forty-five thousand, one hundred four".