21265115630 has 32 divisors (see below), whose sum is σ = 41791528800. Its totient is φ = 7726366720.

The previous prime is 21265115617. The next prime is 21265115689. The reversal of 21265115630 is 3651156212.

It is a congruent 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, 54446 + ... + 213294.

It is an arithmetic number, because the mean of its divisors is an integer number (1305985275).

Almost surely, 2^21265115630 is an apocalyptic number.

21265115630 is a deficient number, since it is larger than the sum of its proper divisors (20526413170).

21265115630 is a wasteful number, since it uses less digits than its factorization.

21265115630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160084.

The product of its (nonzero) digits is 10800, while the sum is 32.

The spelling of 21265115630 in words is "twenty-one billion, two hundred sixty-five million, one hundred fifteen thousand, six hundred thirty".