21039187952 has 40 divisors (see below), whose sum is σ = 41301490464. Its totient is φ = 10381543424.

The previous prime is 21039187951. The next prime is 21039187979. The reversal of 21039187952 is 25978193012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21039187897 and 21039187906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21039187951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 396293 + ... + 446235.

Almost surely, 2^21039187952 is an apocalyptic number.

It is an amenable number.

21039187952 is a deficient number, since it is larger than the sum of its proper divisors (20262302512).

21039187952 is a wasteful number, since it uses less digits than its factorization.

21039187952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50297 (or 50291 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 47.

The spelling of 21039187952 in words is "twenty-one billion, thirty-nine million, one hundred eighty-seven thousand, nine hundred fifty-two".