21929865079 has 2 divisors, whose sum is σ = 21929865080. Its totient is φ = 21929865078.

The previous prime is 21929865059. The next prime is 21929865101. The reversal of 21929865079 is 97056892912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21929865079 - 2⁷ = 21929864951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21929865049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10964932539 + 10964932540.

It is an arithmetic number, because the mean of its divisors is an integer number (10964932540).

Almost surely, 2^21929865079 is an apocalyptic number.

21929865079 is a deficient number, since it is larger than the sum of its proper divisors (1).

21929865079 is an equidigital number, since it uses as much as digits as its factorization.

21929865079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4898880, while the sum is 58.

The spelling of 21929865079 in words is "twenty-one billion, nine hundred twenty-nine million, eight hundred sixty-five thousand, seventy-nine".