21131332230 has 32 divisors (see below), whose sum is σ = 50763073248. Its totient is φ = 5629702400.

The previous prime is 21131332213. The next prime is 21131332253. The reversal of 21131332230 is 3223313112.

It is a junction number, because it is equal to n+sod(n) for n = 21131332197 and 21131332206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 300111 + ... + 363770.

It is an arithmetic number, because the mean of its divisors is an integer number (1586346039).

Almost surely, 2^21131332230 is an apocalyptic number.

21131332230 is an abundant number, since it is smaller than the sum of its proper divisors (29631741018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21131332230 is a wasteful number, since it uses less digits than its factorization.

21131332230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664952.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21131332230 its reverse (3223313112), we get a palindrome (24354645342).

The spelling of 21131332230 in words is "twenty-one billion, one hundred thirty-one million, three hundred thirty-two thousand, two hundred thirty".