21087888940630 has 16 divisors (see below), whose sum is σ = 37961335538640. Its totient is φ = 8434458810592.

The previous prime is 21087888940541. The next prime is 21087888940649. The reversal of 21087888940630 is 3604988878012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86968585 + ... + 87210724.

It is an arithmetic number, because the mean of its divisors is an integer number (2372583471165).

Almost surely, 2^{21087888940630} is an apocalyptic number.

21087888940630 is a deficient number, since it is larger than the sum of its proper divisors (16873446598010).

21087888940630 is a wasteful number, since it uses less digits than its factorization.

21087888940630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174191423.

The product of its (nonzero) digits is 37158912, while the sum is 64.

The spelling of 21087888940630 in words is "twenty-one trillion, eighty-seven billion, eight hundred eighty-eight million, nine hundred forty thousand, six hundred thirty".