21904538230 has 16 divisors (see below), whose sum is σ = 40389832224. Its totient is φ = 8548112320.

The previous prime is 21904538213. The next prime is 21904538237. The reversal of 21904538230 is 3283540912.

It is a self number, because there is not a number n which added to its sum of digits gives 21904538230.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21904538237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26712442 + ... + 26713261.

It is an arithmetic number, because the mean of its divisors is an integer number (2524364514).

Almost surely, 2^21904538230 is an apocalyptic number.

21904538230 is a deficient number, since it is larger than the sum of its proper divisors (18485293994).

21904538230 is a wasteful number, since it uses less digits than its factorization.

21904538230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53425751.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 21904538230 in words is "twenty-one billion, nine hundred four million, five hundred thirty-eight thousand, two hundred thirty".