21122213231 has 32 divisors (see below), whose sum is σ = 25658726400. Its totient is φ = 16997016960.

The previous prime is 21122213221. The next prime is 21122213237. The reversal of 21122213231 is 13231222112.

It is not a de Polignac number, because 21122213231 - 2¹⁴ = 21122196847 is a prime.

It is a super-2 number, since 2×21122213231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122213237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2613665 + ... + 2621733.

It is an arithmetic number, because the mean of its divisors is an integer number (801835200).

Almost surely, 2^21122213231 is an apocalyptic number.

21122213231 is a deficient number, since it is larger than the sum of its proper divisors (4536513169).

21122213231 is a wasteful number, since it uses less digits than its factorization.

21122213231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8399.

The product of its digits is 288, while the sum is 20.

Adding to 21122213231 its reverse (13231222112), we get a palindrome (34353435343).

The spelling of 21122213231 in words is "twenty-one billion, one hundred twenty-two million, two hundred thirteen thousand, two hundred thirty-one".