21412135397 has 2 divisors, whose sum is σ = 21412135398. Its totient is φ = 21412135396.

The previous prime is 21412135373. The next prime is 21412135417. The reversal of 21412135397 is 79353121412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10966068961 + 10446066436 = 104719^2 + 102206^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21412135397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21412135397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21412135337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10706067698 + 10706067699.

It is an arithmetic number, because the mean of its divisors is an integer number (10706067699).

Almost surely, 2^21412135397 is an apocalyptic number.

It is an amenable number.

21412135397 is a deficient number, since it is larger than the sum of its proper divisors (1).

21412135397 is an equidigital number, since it uses as much as digits as its factorization.

21412135397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 38.

The spelling of 21412135397 in words is "twenty-one billion, four hundred twelve million, one hundred thirty-five thousand, three hundred ninety-seven".