21507342168 has 64 divisors (see below), whose sum is σ = 57954405600. Its totient is φ = 6611927040.

The previous prime is 21507342167. The next prime is 21507342179. The reversal of 21507342168 is 86124370512.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21507342167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339288 + ... + 397656.

Almost surely, 2^21507342168 is an apocalyptic number.

It is an amenable number.

21507342168 is an abundant number, since it is smaller than the sum of its proper divisors (36447063432).

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

21507342168 is a wasteful number, since it uses less digits than its factorization.

21507342168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59572 (or 59568 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 21507342168 in words is "twenty-one billion, five hundred seven million, three hundred forty-two thousand, one hundred sixty-eight".