21120223323231 has 8 divisors (see below), whose sum is σ = 31289219738160. Its totient is φ = 14080148882136.

The previous prime is 21120223323209. The next prime is 21120223323253. The reversal of 21120223323231 is 13232332202112.

21120223323231 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 0 + 2 + 2 + 332 + 323 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (21120223323209) and next prime (21120223323253).

It is not a de Polignac number, because 21120223323231 - 2¹⁹ = 21120222798943 is a prime.

It is a super-2 number, since 2×21120223323231² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 782230493453 = 21120223323231 / (2 + 1 + 1 + 2 + 0 + 2 + 2 + 3 + 3 + 2 + 3 + 2 + 3 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 21120223323195 and 21120223323204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120223323271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 391115246700 + ... + 391115246753.

It is an arithmetic number, because the mean of its divisors is an integer number (3911152467270).

Almost surely, 2^{21120223323231} is an apocalyptic number.

21120223323231 is a deficient number, since it is larger than the sum of its proper divisors (10168996414929).

21120223323231 is an equidigital number, since it uses as much as digits as its factorization.

21120223323231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782230493462 (or 782230493456 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

Adding to 21120223323231 its reverse (13232332202112), we get a palindrome (34352555525343).

The spelling of 21120223323231 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-three million, three hundred twenty-three thousand, two hundred thirty-one".