21252605642124 has 48 divisors (see below), whose sum is σ = 50180429365248. Its totient is φ = 7000072000128.

The previous prime is 21252605642119. The next prime is 21252605642153. The reversal of 21252605642124 is 42124650625212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18247692 + ... + 19377395.

It is an arithmetic number, because the mean of its divisors is an integer number (1045425611776).

Almost surely, 2^{21252605642124} is an apocalyptic number.

It is an amenable number.

21252605642124 is an abundant number, since it is smaller than the sum of its proper divisors (28927823723124).

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

21252605642124 is a wasteful number, since it uses less digits than its factorization.

21252605642124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37625654 (or 37625652 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 42.

The spelling of 21252605642124 in words is "twenty-one trillion, two hundred fifty-two billion, six hundred five million, six hundred forty-two thousand, one hundred twenty-four".