21392958140 has 24 divisors (see below), whose sum is σ = 45011462832. Its totient is φ = 8540754560.

The previous prime is 21392958077. The next prime is 21392958157. The reversal of 21392958140 is 4185929312.

It is a junction number, because it is equal to n+sod(n) for n = 21392958091 and 21392958100.

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, 1016114 + ... + 1036953.

It is an arithmetic number, because the mean of its divisors is an integer number (1875477618).

Almost surely, 2^21392958140 is an apocalyptic number.

21392958140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21392958140 is an abundant number, since it is smaller than the sum of its proper divisors (23618504692).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21392958140 is a wasteful number, since it uses less digits than its factorization.

21392958140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2053597 (or 2053595 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 21392958140 in words is "twenty-one billion, three hundred ninety-two million, nine hundred fifty-eight thousand, one hundred forty".