21112312230 has 160 divisors (see below), whose sum is σ = 58826769408. Its totient is φ = 5427259200.

The previous prime is 21112312217. The next prime is 21112312241. The reversal of 21112312230 is 3221321112.

21112312230 is a `hidden beast` number, since 211 + 1 + 231 + 223 + 0 = 666.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 7104645 + ... + 7107615.

Almost surely, 2^21112312230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21112312230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29413384704).

21112312230 is an abundant number, since it is smaller than the sum of its proper divisors (37714457178).

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

21112312230 is a wasteful number, since it uses less digits than its factorization.

21112312230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3304 (or 3295 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21112312230 its reverse (3221321112), we get a palindrome (24333633342).

The spelling of 21112312230 in words is "twenty-one billion, one hundred twelve million, three hundred twelve thousand, two hundred thirty".