21204233134231 has 48 divisors (see below), whose sum is σ = 25407949363200. Its totient is φ = 17635786542528.

The previous prime is 21204233134223. The next prime is 21204233134261. The reversal of 21204233134231 is 13243133240212.

It is not a de Polignac number, because 21204233134231 - 2³ = 21204233134223 is a prime.

It is a super-2 number, since 2×21204233134231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21204233134193 and 21204233134202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204233134261) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 124859805 + ... + 125029513.

It is an arithmetic number, because the mean of its divisors is an integer number (529332278400).

Almost surely, 2^{21204233134231} is an apocalyptic number.

21204233134231 is a deficient number, since it is larger than the sum of its proper divisors (4203716228969).

21204233134231 is a wasteful number, since it uses less digits than its factorization.

21204233134231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170236 (or 170229 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 21204233134231 its reverse (13243133240212), we get a palindrome (34447366374443).

The spelling of 21204233134231 in words is "twenty-one trillion, two hundred four billion, two hundred thirty-three million, one hundred thirty-four thousand, two hundred thirty-one".