21682260979 has 2 divisors, whose sum is σ = 21682260980. Its totient is φ = 21682260978.

The previous prime is 21682260917. The next prime is 21682260983. The reversal of 21682260979 is 97906228612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21682260979 - 2³¹ = 19534777331 is a prime.

It is a super-2 number, since 2×21682260979² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21682260079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10841130489 + 10841130490.

It is an arithmetic number, because the mean of its divisors is an integer number (10841130490).

Almost surely, 2^21682260979 is an apocalyptic number.

21682260979 is a deficient number, since it is larger than the sum of its proper divisors (1).

21682260979 is an equidigital number, since it uses as much as digits as its factorization.

21682260979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 21682260979 in words is "twenty-one billion, six hundred eighty-two million, two hundred sixty thousand, nine hundred seventy-nine".