21514500979 has 2 divisors, whose sum is σ = 21514500980. Its totient is φ = 21514500978.

The previous prime is 21514500971. The next prime is 21514501031. The reversal of 21514500979 is 97900541512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21514500979 - 2³ = 21514500971 is a prime.

It is not a weakly prime, because it can be changed into another prime (21514500971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10757250489 + 10757250490.

It is an arithmetic number, because the mean of its divisors is an integer number (10757250490).

Almost surely, 2^21514500979 is an apocalyptic number.

21514500979 is a deficient number, since it is larger than the sum of its proper divisors (1).

21514500979 is an equidigital number, since it uses as much as digits as its factorization.

21514500979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113400, while the sum is 43.

The spelling of 21514500979 in words is "twenty-one billion, five hundred fourteen million, five hundred thousand, nine hundred seventy-nine".