21440355313 has 16 divisors (see below), whose sum is σ = 23905728000. Its totient is φ = 19092709440.

The previous prime is 21440355289. The next prime is 21440355319. The reversal of 21440355313 is 31355304412.

It is a cyclic number.

It is not a de Polignac number, because 21440355313 - 2¹⁷ = 21440224241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21440355319) 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, 440988 + ... + 487186.

It is an arithmetic number, because the mean of its divisors is an integer number (1494108000).

Almost surely, 2^21440355313 is an apocalyptic number.

It is an amenable number.

21440355313 is a deficient number, since it is larger than the sum of its proper divisors (2465372687).

21440355313 is a wasteful number, since it uses less digits than its factorization.

21440355313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47472.

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 21440355313 its reverse (31355304412), we get a palindrome (52795659725).

The spelling of 21440355313 in words is "twenty-one billion, four hundred forty million, three hundred fifty-five thousand, three hundred thirteen".