21102021303231 has 64 divisors (see below), whose sum is σ = 32104370672640. Its totient is φ = 12227162112000.

The previous prime is 21102021303229. The next prime is 21102021303241. The reversal of 21102021303231 is 13230312020112.

It is not a de Polignac number, because 21102021303231 - 2¹ = 21102021303229 is a prime.

It is a super-2 number, since 2×21102021303231² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21102021303198 and 21102021303207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102021303241) 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, 915835071 + ... + 915858111.

It is an arithmetic number, because the mean of its divisors is an integer number (501630791760).

Almost surely, 2^{21102021303231} is an apocalyptic number.

21102021303231 is a deficient number, since it is larger than the sum of its proper divisors (11002349369409).

21102021303231 is a wasteful number, since it uses less digits than its factorization.

21102021303231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25405 (or 25359 counting only the distinct ones).

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

Adding to 21102021303231 its reverse (13230312020112), we get a palindrome (34332333323343).

The spelling of 21102021303231 in words is "twenty-one trillion, one hundred two billion, twenty-one million, three hundred three thousand, two hundred thirty-one".