21157614167 has 4 divisors (see below), whose sum is σ = 21235686816. Its totient is φ = 21079541520.

The previous prime is 21157614139. The next prime is 21157614199. The reversal of 21157614167 is 76141675112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21157614167 - 2¹⁶ = 21157548631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21157619167) 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, 39035918 + ... + 39036459.

It is an arithmetic number, because the mean of its divisors is an integer number (5308921704).

Almost surely, 2^21157614167 is an apocalyptic number.

21157614167 is a deficient number, since it is larger than the sum of its proper divisors (78072649).

21157614167 is an equidigital number, since it uses as much as digits as its factorization.

21157614167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78072648.

The product of its digits is 70560, while the sum is 41.

The spelling of 21157614167 in words is "twenty-one billion, one hundred fifty-seven million, six hundred fourteen thousand, one hundred sixty-seven".