21231203213331 has 32 divisors (see below), whose sum is σ = 32305030202880. Its totient is φ = 13771038093408.

The previous prime is 21231203213329. The next prime is 21231203213351. The reversal of 21231203213331 is 13331230213212.

21231203213331 is a `hidden beast` number, since 2 + 1 + 2 + 3 + 1 + 2 + 0 + 321 + 3 + 331 = 666.

It is not a de Polignac number, because 21231203213331 - 2¹ = 21231203213329 is a prime.

It is a super-2 number, since 2×21231203213331² (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 = 21231203213295 and 21231203213304.

It is not an unprimeable number, because it can be changed into a prime (21231203213351) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25227330 + ... + 26055336.

It is an arithmetic number, because the mean of its divisors is an integer number (1009532193840).

Almost surely, 2^{21231203213331} is an apocalyptic number.

21231203213331 is a deficient number, since it is larger than the sum of its proper divisors (11073826989549).

21231203213331 is a wasteful number, since it uses less digits than its factorization.

21231203213331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853720 (or 853714 counting only the distinct ones).

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

Adding to 21231203213331 its reverse (13331230213212), we get a palindrome (34562433426543).

The spelling of 21231203213331 in words is "twenty-one trillion, two hundred thirty-one billion, two hundred three million, two hundred thirteen thousand, three hundred thirty-one".