21162490507 has 2 divisors, whose sum is σ = 21162490508. Its totient is φ = 21162490506.

The previous prime is 21162490457. The next prime is 21162490571. The reversal of 21162490507 is 70509426112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21162490507 - 2⁷ = 21162490379 is a prime.

It is not a weakly prime, because it can be changed into another prime (21162490207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10581245253 + 10581245254.

It is an arithmetic number, because the mean of its divisors is an integer number (10581245254).

Almost surely, 2^21162490507 is an apocalyptic number.

21162490507 is a deficient number, since it is larger than the sum of its proper divisors (1).

21162490507 is an equidigital number, since it uses as much as digits as its factorization.

21162490507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 21162490507 in words is "twenty-one billion, one hundred sixty-two million, four hundred ninety thousand, five hundred seven".