21311112330 has 48 divisors (see below), whose sum is σ = 55629703584. Its totient is φ = 5660316000.

The previous prime is 21311112299. The next prime is 21311112341. The reversal of 21311112330 is 3321111312.

21311112330 is a `hidden beast` number, since 21 + 311 + 1 + 1 + 2 + 330 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 449104 + ... + 494283.

It is an arithmetic number, because the mean of its divisors is an integer number (1158952158).

Almost surely, 2^21311112330 is an apocalyptic number.

21311112330 is an abundant number, since it is smaller than the sum of its proper divisors (34318591254).

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

21311112330 is a wasteful number, since it uses less digits than its factorization.

21311112330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943651 (or 943648 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21311112330 its reverse (3321111312), we get a palindrome (24632223642).

The spelling of 21311112330 in words is "twenty-one billion, three hundred eleven million, one hundred twelve thousand, three hundred thirty".