21634107276 has 12 divisors (see below), whose sum is σ = 50479583672. Its totient is φ = 7211369088.

The previous prime is 21634107251. The next prime is 21634107277. The reversal of 21634107276 is 67270143612.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21634107276² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (21634107277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 901421125 + ... + 901421148.

Almost surely, 2^21634107276 is an apocalyptic number.

It is an amenable number.

21634107276 is an abundant number, since it is smaller than the sum of its proper divisors (28845476396).

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

21634107276 is a wasteful number, since it uses less digits than its factorization.

21634107276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1802842280 (or 1802842278 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 39.

The spelling of 21634107276 in words is "twenty-one billion, six hundred thirty-four million, one hundred seven thousand, two hundred seventy-six".