21130320401 has 2 divisors, whose sum is σ = 21130320402. Its totient is φ = 21130320400.

The previous prime is 21130320397. The next prime is 21130320433. The reversal of 21130320401 is 10402303112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12331880401 + 8798440000 = 111049^2 + 93800^2 .

It is a cyclic number.

It is not a de Polignac number, because 21130320401 - 2² = 21130320397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21130320401.

It is not a weakly prime, because it can be changed into another prime (21130320461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565160200 + 10565160201.

It is an arithmetic number, because the mean of its divisors is an integer number (10565160201).

Almost surely, 2^21130320401 is an apocalyptic number.

It is an amenable number.

21130320401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130320401 is an equidigital number, since it uses as much as digits as its factorization.

21130320401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21130320401 its reverse (10402303112), we get a palindrome (31532623513).

The spelling of 21130320401 in words is "twenty-one billion, one hundred thirty million, three hundred twenty thousand, four hundred one".