21321122331 has 16 divisors (see below), whose sum is σ = 29192638464. Its totient is φ = 13836068064.

The previous prime is 21321122311. The next prime is 21321122351. The reversal of 21321122331 is 13322112312.

It is an interprime number because it is at equal distance from previous prime (21321122311) and next prime (21321122351).

It is not a de Polignac number, because 21321122331 - 2¹⁰ = 21321121307 is a prime.

It is a super-2 number, since 2×21321122331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21321122298 and 21321122307.

It is not an unprimeable number, because it can be changed into a prime (21321122311) 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, 507741 + ... + 548126.

It is an arithmetic number, because the mean of its divisors is an integer number (1824539904).

Almost surely, 2^21321122331 is an apocalyptic number.

21321122331 is a deficient number, since it is larger than the sum of its proper divisors (7871516133).

21321122331 is a wasteful number, since it uses less digits than its factorization.

21321122331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056050.

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

Adding to 21321122331 its reverse (13322112312), we get a palindrome (34643234643).

The spelling of 21321122331 in words is "twenty-one billion, three hundred twenty-one million, one hundred twenty-two thousand, three hundred thirty-one".