21412520413397 has 4 divisors (see below), whose sum is σ = 21429943132620. Its totient is φ = 21395097694176.

The previous prime is 21412520413391. The next prime is 21412520413399. The reversal of 21412520413397 is 79331402521412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19774821778321 + 1637698635076 = 4446889^2 + 1279726^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21412520413397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21412520413391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8711357768 + ... + 8711360225.

It is an arithmetic number, because the mean of its divisors is an integer number (5357485783155).

Almost surely, 2^{21412520413397} is an apocalyptic number.

It is an amenable number.

21412520413397 is a deficient number, since it is larger than the sum of its proper divisors (17422719223).

21412520413397 is a wasteful number, since it uses less digits than its factorization.

21412520413397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17422719222.

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 21412520413397 in words is "twenty-one trillion, four hundred twelve billion, five hundred twenty million, four hundred thirteen thousand, three hundred ninety-seven".