21362354400397 has 2 divisors, whose sum is σ = 21362354400398. Its totient is φ = 21362354400396.

The previous prime is 21362354400371. The next prime is 21362354400419. The reversal of 21362354400397 is 79300445326312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11640611243556 + 9721743156841 = 3411834^2 + 3117971^2 .

It is a cyclic number.

It is not a de Polignac number, because 21362354400397 - 2²³ = 21362346011789 is a prime.

It is a super-2 number, since 2×21362354400397² (a number of 27 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 21362354400397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21362354400347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10681177200198 + 10681177200199.

It is an arithmetic number, because the mean of its divisors is an integer number (10681177200199).

Almost surely, 2^{21362354400397} is an apocalyptic number.

It is an amenable number.

21362354400397 is a deficient number, since it is larger than the sum of its proper divisors (1).

21362354400397 is an equidigital number, since it uses as much as digits as its factorization.

21362354400397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3265920, while the sum is 49.

The spelling of 21362354400397 in words is "twenty-one trillion, three hundred sixty-two billion, three hundred fifty-four million, four hundred thousand, three hundred ninety-seven".