21431066013413 has 16 divisors (see below), whose sum is σ = 24912710161920. Its totient is φ = 18054561030000.

The previous prime is 21431066013403. The next prime is 21431066013463. The reversal of 21431066013413 is 31431066013412.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21431066013413 - 2⁶ = 21431066013349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431066013403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3050663 + ... + 7222788.

It is an arithmetic number, because the mean of its divisors is an integer number (1557044385120).

Almost surely, 2^{21431066013413} is an apocalyptic number.

It is an amenable number.

21431066013413 is a deficient number, since it is larger than the sum of its proper divisors (3481644148507).

21431066013413 is a wasteful number, since it uses less digits than its factorization.

21431066013413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10278568.

The product of its (nonzero) digits is 31104, while the sum is 35.

Subtracting 21431066013413 from its reverse (31431066013412), we obtain a palindrome (9999999999999).

The spelling of 21431066013413 in words is "twenty-one trillion, four hundred thirty-one billion, sixty-six million, thirteen thousand, four hundred thirteen".