21304753634 has 16 divisors (see below), whose sum is σ = 33871436928. Its totient is φ = 10015551552.

The previous prime is 21304753609. The next prime is 21304753649. The reversal of 21304753634 is 43635740312.

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, 285302 + ... + 352145.

It is an arithmetic number, because the mean of its divisors is an integer number (2116964808).

Almost surely, 2^21304753634 is an apocalyptic number.

21304753634 is a deficient number, since it is larger than the sum of its proper divisors (12566683294).

21304753634 is a wasteful number, since it uses less digits than its factorization.

21304753634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638449.

The product of its (nonzero) digits is 181440, while the sum is 38.

The spelling of 21304753634 in words is "twenty-one billion, three hundred four million, seven hundred fifty-three thousand, six hundred thirty-four".