21107242115 has 16 divisors (see below), whose sum is σ = 26446992480. Its totient is φ = 16151143680.

The previous prime is 21107242097. The next prime is 21107242147. The reversal of 21107242115 is 51124270112.

It is not a de Polignac number, because 21107242115 - 2¹⁶ = 21107176579 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 664706 + ... + 695735.

It is an arithmetic number, because the mean of its divisors is an integer number (1652937030).

Almost surely, 2^21107242115 is an apocalyptic number.

21107242115 is a deficient number, since it is larger than the sum of its proper divisors (5339750365).

21107242115 is a wasteful number, since it uses less digits than its factorization.

21107242115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1360582.

The product of its (nonzero) digits is 1120, while the sum is 26.

The spelling of 21107242115 in words is "twenty-one billion, one hundred seven million, two hundred forty-two thousand, one hundred fifteen".