21231223110 has 48 divisors (see below), whose sum is σ = 56547560160. Its totient is φ = 5523569280.

The previous prime is 21231223093. The next prime is 21231223183. The reversal of 21231223110 is 1132213212.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2873170 + ... + 2880549.

It is an arithmetic number, because the mean of its divisors is an integer number (1178074170).

Almost surely, 2^21231223110 is an apocalyptic number.

21231223110 is an abundant number, since it is smaller than the sum of its proper divisors (35316337050).

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

21231223110 is a wasteful number, since it uses less digits than its factorization.

21231223110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5753773 (or 5753770 counting only the distinct ones).

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

Adding to 21231223110 its reverse (1132213212), we get a palindrome (22363436322).

The spelling of 21231223110 in words is "twenty-one billion, two hundred thirty-one million, two hundred twenty-three thousand, one hundred ten".