21303121323231 has 192 divisors, whose sum is σ = 37597975564800. Its totient is φ = 11870686080000.

The previous prime is 21303121323181. The next prime is 21303121323233. The reversal of 21303121323231 is 13232312130312.

21303121323231 is a `hidden beast` number, since 2 + 1 + 3 + 0 + 312 + 1 + 323 + 23 + 1 = 666.

It is not a de Polignac number, because 21303121323231 - 2¹³ = 21303121315039 is a prime.

It is a super-2 number, since 2×21303121323231² (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).

It is a junction number, because it is equal to n+sod(n) for n = 21303121323195 and 21303121323204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303121323233) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 920965536 + ... + 920988666.

It is an arithmetic number, because the mean of its divisors is an integer number (195822789400).

Almost surely, 2^{21303121323231} is an apocalyptic number.

21303121323231 is a deficient number, since it is larger than the sum of its proper divisors (16294854241569).

21303121323231 is a wasteful number, since it uses less digits than its factorization.

21303121323231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23619 (or 23602 counting only the distinct ones).

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

Adding to 21303121323231 its reverse (13232312130312), we get a palindrome (34535433453543).

It can be divided in two parts, 2130312 and 1323231, that added together give a palindrome (3453543).

The spelling of 21303121323231 in words is "twenty-one trillion, three hundred three billion, one hundred twenty-one million, three hundred twenty-three thousand, two hundred thirty-one".