21157636151 has 2 divisors, whose sum is σ = 21157636152. Its totient is φ = 21157636150.

The previous prime is 21157636139. The next prime is 21157636211. The reversal of 21157636151 is 15163675112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21157636151 - 2²² = 21153441847 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21157635151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10578818075 + 10578818076.

It is an arithmetic number, because the mean of its divisors is an integer number (10578818076).

Almost surely, 2^21157636151 is an apocalyptic number.

21157636151 is a deficient number, since it is larger than the sum of its proper divisors (1).

21157636151 is an equidigital number, since it uses as much as digits as its factorization.

21157636151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37800, while the sum is 38.

The spelling of 21157636151 in words is "twenty-one billion, one hundred fifty-seven million, six hundred thirty-six thousand, one hundred fifty-one".