21339366401 has 2 divisors, whose sum is σ = 21339366402. Its totient is φ = 21339366400.

The previous prime is 21339366383. The next prime is 21339366407. The reversal of 21339366401 is 10466393312.

It is a Cunningham number, because it is equal to 146080²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21339366400 + 1 = 146080^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 21339366401 - 2¹⁴ = 21339350017 is a prime.

It is a super-2 number, since 2×21339366401² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21339366407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10669683200 + 10669683201.

It is an arithmetic number, because the mean of its divisors is an integer number (10669683201).

Almost surely, 2^21339366401 is an apocalyptic number.

It is an amenable number.

21339366401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21339366401 is an equidigital number, since it uses as much as digits as its factorization.

21339366401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 38.

The spelling of 21339366401 in words is "twenty-one billion, three hundred thirty-nine million, three hundred sixty-six thousand, four hundred one".