21120310232 has 16 divisors (see below), whose sum is σ = 45257807760. Its totient is φ = 9051561504.

The previous prime is 21120310231. The next prime is 21120310259. The reversal of 21120310232 is 23201302112.

It is a self number, because there is not a number n which added to its sum of digits gives 21120310232.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120310231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188574143 + ... + 188574254.

It is an arithmetic number, because the mean of its divisors is an integer number (2828612985).

Almost surely, 2^21120310232 is an apocalyptic number.

It is an amenable number.

21120310232 is an abundant number, since it is smaller than the sum of its proper divisors (24137497528).

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

21120310232 is a wasteful number, since it uses less digits than its factorization.

21120310232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377148410 (or 377148406 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21120310232 its reverse (23201302112), we get a palindrome (44321612344).

The spelling of 21120310232 in words is "twenty-one billion, one hundred twenty million, three hundred ten thousand, two hundred thirty-two".