21379364401 has 2 divisors, whose sum is σ = 21379364402. Its totient is φ = 21379364400.

The previous prime is 21379364387. The next prime is 21379364411. The reversal of 21379364401 is 10446397312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20408979600 + 970384801 = 142860^2 + 31151^2 .

It is a cyclic number.

It is not a de Polignac number, because 21379364401 - 2³¹ = 19231880753 is a prime.

It is not a weakly prime, because it can be changed into another prime (21379364411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10689682200 + 10689682201.

It is an arithmetic number, because the mean of its divisors is an integer number (10689682201).

Almost surely, 2^21379364401 is an apocalyptic number.

It is an amenable number.

21379364401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21379364401 is an equidigital number, since it uses as much as digits as its factorization.

21379364401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 40.

The spelling of 21379364401 in words is "twenty-one billion, three hundred seventy-nine million, three hundred sixty-four thousand, four hundred one".