21222113331 has 32 divisors (see below), whose sum is σ = 29424844800. Its totient is φ = 13590806400.

The previous prime is 21222113329. The next prime is 21222113351. The reversal of 21222113331 is 13331122212.

It is not a de Polignac number, because 21222113331 - 2¹ = 21222113329 is a prime.

It is a super-2 number, since 2×21222113331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21222113298 and 21222113307.

It is not an unprimeable number, because it can be changed into a prime (21222113321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10887745 + ... + 10889693.

It is an arithmetic number, because the mean of its divisors is an integer number (919526400).

Almost surely, 2^21222113331 is an apocalyptic number.

21222113331 is a deficient number, since it is larger than the sum of its proper divisors (8202731469).

21222113331 is a wasteful number, since it uses less digits than its factorization.

21222113331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2787.

The product of its digits is 432, while the sum is 21.

Adding to 21222113331 its reverse (13331122212), we get a palindrome (34553235543).

The spelling of 21222113331 in words is "twenty-one billion, two hundred twenty-two million, one hundred thirteen thousand, three hundred thirty-one".