21426876739 has 2 divisors, whose sum is σ = 21426876740. Its totient is φ = 21426876738.

The previous prime is 21426876649. The next prime is 21426876743. The reversal of 21426876739 is 93767862412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21426876739 - 2⁹ = 21426876227 is a prime.

It is a super-2 number, since 2×21426876739² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21426876739.

It is not a weakly prime, because it can be changed into another prime (21426876799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10713438369 + 10713438370.

It is an arithmetic number, because the mean of its divisors is an integer number (10713438370).

Almost surely, 2^21426876739 is an apocalyptic number.

21426876739 is a deficient number, since it is larger than the sum of its proper divisors (1).

21426876739 is an equidigital number, since it uses as much as digits as its factorization.

21426876739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6096384, while the sum is 55.

The spelling of 21426876739 in words is "twenty-one billion, four hundred twenty-six million, eight hundred seventy-six thousand, seven hundred thirty-nine".