21151165107 has 8 divisors (see below), whose sum is σ = 28963757776. Its totient is φ = 13719674592.

The previous prime is 21151165073. The next prime is 21151165141. The reversal of 21151165107 is 70156115112.

It is an interprime number because it is at equal distance from previous prime (21151165073) and next prime (21151165141).

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

It is not a de Polignac number, because 21151165107 - 2⁸ = 21151164851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21151165207) 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 7 ways as a sum of consecutive naturals, for example, 95275408 + ... + 95275629.

It is an arithmetic number, because the mean of its divisors is an integer number (3620469722).

Almost surely, 2^21151165107 is an apocalyptic number.

21151165107 is a deficient number, since it is larger than the sum of its proper divisors (7812592669).

21151165107 is a wasteful number, since it uses less digits than its factorization.

21151165107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190551077.

The product of its (nonzero) digits is 2100, while the sum is 30.

The spelling of 21151165107 in words is "twenty-one billion, one hundred fifty-one million, one hundred sixty-five thousand, one hundred seven".