21316732634 has 8 divisors (see below), whose sum is σ = 33077688660. Its totient is φ = 10290836416.

The previous prime is 21316732609. The next prime is 21316732637. The reversal of 21316732634 is 43623761312.

It can be written as a sum of positive squares in 2 ways, for example, as 18280392025 + 3036340609 = 135205^2 + 55103^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21316732637) 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 3 ways as a sum of consecutive naturals, for example, 183764879 + ... + 183764994.

Almost surely, 2^21316732634 is an apocalyptic number.

21316732634 is a deficient number, since it is larger than the sum of its proper divisors (11760956026).

21316732634 is a wasteful number, since it uses less digits than its factorization.

21316732634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367529904.

The product of its digits is 108864, while the sum is 38.

The spelling of 21316732634 in words is "twenty-one billion, three hundred sixteen million, seven hundred thirty-two thousand, six hundred thirty-four".