21310369542 has 96 divisors (see below), whose sum is σ = 59697840384. Its totient is φ = 5535151200.

The previous prime is 21310369519. The next prime is 21310369547. The reversal of 21310369542 is 24596301312.

21310369542 is a `hidden beast` number, since 2 + 1 + 3 + 103 + 6 + 9 + 542 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21310369497 and 21310369506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310369547) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 247309 + ... + 322152.

It is an arithmetic number, because the mean of its divisors is an integer number (621852504).

Almost surely, 2^21310369542 is an apocalyptic number.

21310369542 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21310369542 is an abundant number, since it is smaller than the sum of its proper divisors (38387470842).

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

21310369542 is a wasteful number, since it uses less digits than its factorization.

21310369542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569496 (or 569484 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The spelling of 21310369542 in words is "twenty-one billion, three hundred ten million, three hundred sixty-nine thousand, five hundred forty-two".