21321121122231 has 64 divisors (see below), whose sum is σ = 32995771299840. Its totient is φ = 11994996326400.

The previous prime is 21321121122181. The next prime is 21321121122239. The reversal of 21321121122231 is 13222112112312.

It is not a de Polignac number, because 21321121122231 - 2¹⁸ = 21321120860087 is a prime.

It is a super-2 number, since 2×21321121122231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321121122239) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1024600155 + ... + 1024620963.

It is an arithmetic number, because the mean of its divisors is an integer number (515558926560).

Almost surely, 2^{21321121122231} is an apocalyptic number.

21321121122231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21321121122231 is a deficient number, since it is larger than the sum of its proper divisors (11674650177609).

21321121122231 is a wasteful number, since it uses less digits than its factorization.

21321121122231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23616.

The product of its digits is 576, while the sum is 24.

Adding to 21321121122231 its reverse (13222112112312), we get a palindrome (34543233234543).

The spelling of 21321121122231 in words is "twenty-one trillion, three hundred twenty-one billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred thirty-one".