21311320230 has 24 divisors (see below), whose sum is σ = 55409432832. Its totient is φ = 5683018704.

The previous prime is 21311320229. The next prime is 21311320249. The reversal of 21311320230 is 3202311312.

21311320230 is a `hidden beast` number, since 2 + 1 + 311 + 320 + 2 + 30 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118396134 + ... + 118396313.

It is an arithmetic number, because the mean of its divisors is an integer number (2308726368).

Almost surely, 2^21311320230 is an apocalyptic number.

21311320230 is an abundant number, since it is smaller than the sum of its proper divisors (34098112602).

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

21311320230 is a wasteful number, since it uses less digits than its factorization.

21311320230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236792460 (or 236792457 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21311320230 its reverse (3202311312), we get a palindrome (24513631542).

The spelling of 21311320230 in words is "twenty-one billion, three hundred eleven million, three hundred twenty thousand, two hundred thirty".