21132213231 has 8 divisors (see below), whose sum is σ = 29659246720. Its totient is φ = 13346660952.

The previous prime is 21132213209. The next prime is 21132213247. The reversal of 21132213231 is 13231223112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21132213231 - 2⁵ = 21132213199 is a prime.

It is a super-2 number, since 2×21132213231² (a number of 21 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 = 21132213198 and 21132213207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132413231) 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, 185370235 + ... + 185370348.

It is an arithmetic number, because the mean of its divisors is an integer number (3707405840).

Almost surely, 2^21132213231 is an apocalyptic number.

21132213231 is a deficient number, since it is larger than the sum of its proper divisors (8527033489).

21132213231 is a wasteful number, since it uses less digits than its factorization.

21132213231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370740605.

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

Adding to 21132213231 its reverse (13231223112), we get a palindrome (34363436343).

The spelling of 21132213231 in words is "twenty-one billion, one hundred thirty-two million, two hundred thirteen thousand, two hundred thirty-one".