21634885470 has 64 divisors (see below), whose sum is σ = 56699896320. Its totient is φ = 5239651200.

The previous prime is 21634885451. The next prime is 21634885501. The reversal of 21634885470 is 7458843612.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 308436 + ... + 372024.

It is an arithmetic number, because the mean of its divisors is an integer number (885935880).

Almost surely, 2^21634885470 is an apocalyptic number.

21634885470 is an abundant number, since it is smaller than the sum of its proper divisors (35065010850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21634885470 is a wasteful number, since it uses less digits than its factorization.

21634885470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64641.

The product of its (nonzero) digits is 1290240, while the sum is 48.

The spelling of 21634885470 in words is "twenty-one billion, six hundred thirty-four million, eight hundred eighty-five thousand, four hundred seventy".