21423637115 has 8 divisors (see below), whose sum is σ = 25709587488. Its totient is φ = 17138094400.

The previous prime is 21423637073. The next prime is 21423637121. The reversal of 21423637115 is 51173632412.

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

It is a de Polignac number, because none of the positive numbers 2^k-21423637115 is a prime.

It is a Duffinian number.

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, 28994 + ... + 209016.

It is an arithmetic number, because the mean of its divisors is an integer number (3213698436).

Almost surely, 2^21423637115 is an apocalyptic number.

21423637115 is a deficient number, since it is larger than the sum of its proper divisors (4285950373).

21423637115 is a wasteful number, since it uses less digits than its factorization.

21423637115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203829.

The product of its digits is 30240, while the sum is 35.

The spelling of 21423637115 in words is "twenty-one billion, four hundred twenty-three million, six hundred thirty-seven thousand, one hundred fifteen".