21311411313 has 16 divisors (see below), whose sum is σ = 29946470400. Its totient is φ = 13443765840.

The previous prime is 21311411309. The next prime is 21311411371. The reversal of 21311411313 is 31311411312.

It is not a de Polignac number, because 21311411313 - 2² = 21311411309 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21311411313.

It is not an unprimeable number, because it can be changed into a prime (21311413313) 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, 174993 + ... + 270638.

It is an arithmetic number, because the mean of its divisors is an integer number (1871654400).

Almost surely, 2^21311411313 is an apocalyptic number.

It is an amenable number.

21311411313 is a deficient number, since it is larger than the sum of its proper divisors (8635059087).

21311411313 is a wasteful number, since it uses less digits than its factorization.

21311411313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446492.

The product of its digits is 216, while the sum is 21.

Adding to 21311411313 its reverse (31311411312), we get a palindrome (52622822625).

Subtracting 21311411313 from its reverse (31311411312), we obtain a palindrome (9999999999).

The spelling of 21311411313 in words is "twenty-one billion, three hundred eleven million, four hundred eleven thousand, three hundred thirteen".