21162610451 has 2 divisors, whose sum is σ = 21162610452. Its totient is φ = 21162610450.

The previous prime is 21162610409. The next prime is 21162610487. The reversal of 21162610451 is 15401626112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21162610451 - 2²⁶ = 21095501587 is a prime.

It is a super-2 number, since 2×21162610451² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21162616451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10581305225 + 10581305226.

It is an arithmetic number, because the mean of its divisors is an integer number (10581305226).

Almost surely, 2^21162610451 is an apocalyptic number.

21162610451 is a deficient number, since it is larger than the sum of its proper divisors (1).

21162610451 is an equidigital number, since it uses as much as digits as its factorization.

21162610451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The spelling of 21162610451 in words is "twenty-one billion, one hundred sixty-two million, six hundred ten thousand, four hundred fifty-one".