21231013110 has 32 divisors (see below), whose sum is σ = 50970339072. Its totient is φ = 5659836000.

The previous prime is 21231013093. The next prime is 21231013201. The reversal of 21231013110 is 1131013212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21231013110.

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, 11314 + ... + 206373.

It is an arithmetic number, because the mean of its divisors is an integer number (1592823096).

Almost surely, 2^21231013110 is an apocalyptic number.

21231013110 is an abundant number, since it is smaller than the sum of its proper divisors (29739325962).

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

21231013110 is a wasteful number, since it uses less digits than its factorization.

21231013110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220948.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21231013110 its reverse (1131013212), we get a palindrome (22362026322).

The spelling of 21231013110 in words is "twenty-one billion, two hundred thirty-one million, thirteen thousand, one hundred ten".