21630304579205 has 32 divisors (see below), whose sum is σ = 30517536132864. Its totient is φ = 14407001680896.

The previous prime is 21630304579201. The next prime is 21630304579207. The reversal of 21630304579205 is 50297540303612.

It is not a de Polignac number, because 21630304579205 - 2² = 21630304579201 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21630304579205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21630304579201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13315487 + ... + 14851356.

It is an arithmetic number, because the mean of its divisors is an integer number (953673004152).

Almost surely, 2^{21630304579205} is an apocalyptic number.

It is an amenable number.

21630304579205 is a deficient number, since it is larger than the sum of its proper divisors (8887231553659).

21630304579205 is a wasteful number, since it uses less digits than its factorization.

21630304579205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28167485.

The product of its (nonzero) digits is 1360800, while the sum is 47.

The spelling of 21630304579205 in words is "twenty-one trillion, six hundred thirty billion, three hundred four million, five hundred seventy-nine thousand, two hundred five".