21321230231331 has 8 divisors (see below), whose sum is σ = 31587007750160. Its totient is φ = 14214153487536.

The previous prime is 21321230231303. The next prime is 21321230231359. The reversal of 21321230231331 is 13313203212312.

21321230231331 is a `hidden beast` number, since 2 + 1 + 3 + 2 + 12 + 302 + 313 + 31 = 666.

It is an interprime number because it is at equal distance from previous prime (21321230231303) and next prime (21321230231359).

It is not a de Polignac number, because 21321230231331 - 2¹⁸ = 21321229969187 is a prime.

It is a super-2 number, since 2×21321230231331² (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: 789675193753 = 21321230231331 / (2 + 1 + 3 + 2 + 1 + 2 + 3 + 0 + 2 + 3 + 1 + 3 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21321230231295 and 21321230231304.

It is not an unprimeable number, because it can be changed into a prime (21321230231131) 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, 394837596850 + ... + 394837596903.

It is an arithmetic number, because the mean of its divisors is an integer number (3948375968770).

Almost surely, 2^{21321230231331} is an apocalyptic number.

21321230231331 is a deficient number, since it is larger than the sum of its proper divisors (10265777518829).

21321230231331 is an equidigital number, since it uses as much as digits as its factorization.

21321230231331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789675193762 (or 789675193756 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

Adding to 21321230231331 its reverse (13313203212312), we get a palindrome (34634433443643).

The spelling of 21321230231331 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred thirty million, two hundred thirty-one thousand, three hundred thirty-one".