21222031013405 has 16 divisors (see below), whose sum is σ = 25639012350000. Its totient is φ = 16862589473280.

The previous prime is 21222031013371. The next prime is 21222031013413. The reversal of 21222031013405 is 50431013022212.

It can be written as a sum of positive squares in 8 ways, for example, as 959951212441 + 20262079800964 = 979771^2 + 4501342^2 .

It is not a de Polignac number, because 21222031013405 - 2⁸ = 21222031013149 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10693721 + ... + 12521969.

It is an arithmetic number, because the mean of its divisors is an integer number (1602438271875).

Almost surely, 2^{21222031013405} is an apocalyptic number.

It is an amenable number.

21222031013405 is a deficient number, since it is larger than the sum of its proper divisors (4416981336595).

21222031013405 is a wasteful number, since it uses less digits than its factorization.

21222031013405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1843984.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21222031013405 its reverse (50431013022212), we get a palindrome (71653044035617).

The spelling of 21222031013405 in words is "twenty-one trillion, two hundred twenty-two billion, thirty-one million, thirteen thousand, four hundred five".