21164632323 has 16 divisors (see below), whose sum is σ = 30123129600. Its totient is φ = 13178864160.

The previous prime is 21164632319. The next prime is 21164632417. The reversal of 21164632323 is 32323646112.

It is a happy number.

It is not a de Polignac number, because 21164632323 - 2² = 21164632319 is a prime.

It is a super-2 number, since 2×21164632323² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21164630323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2610808 + ... + 2618901.

It is an arithmetic number, because the mean of its divisors is an integer number (1882695600).

Almost surely, 2^21164632323 is an apocalyptic number.

21164632323 is a deficient number, since it is larger than the sum of its proper divisors (8958497277).

21164632323 is a wasteful number, since it uses less digits than its factorization.

21164632323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5229802.

The product of its digits is 31104, while the sum is 33.

The spelling of 21164632323 in words is "twenty-one billion, one hundred sixty-four million, six hundred thirty-two thousand, three hundred twenty-three".