21222113431 has 4 divisors (see below), whose sum is σ = 21252046600. Its totient is φ = 21192180264.

The previous prime is 21222113417. The next prime is 21222113467. The reversal of 21222113431 is 13431122212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21222113431 - 2⁷ = 21222113303 is a prime.

It is a super-2 number, since 2×21222113431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222113401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14965521 + ... + 14966938.

It is an arithmetic number, because the mean of its divisors is an integer number (5313011650).

Almost surely, 2^21222113431 is an apocalyptic number.

21222113431 is a deficient number, since it is larger than the sum of its proper divisors (29933169).

21222113431 is an equidigital number, since it uses as much as digits as its factorization.

21222113431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29933168.

The product of its digits is 576, while the sum is 22.

Adding to 21222113431 its reverse (13431122212), we get a palindrome (34653235643).

The spelling of 21222113431 in words is "twenty-one billion, two hundred twenty-two million, one hundred thirteen thousand, four hundred thirty-one".