21232123110 has 128 divisors (see below), whose sum is σ = 61986885120. Its totient is φ = 5128790400.

The previous prime is 21232123091. The next prime is 21232123111. The reversal of 21232123110 is 1132123212.

21232123110 is a `hidden beast` number, since 212 + 321 + 23 + 110 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232123111) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 827880 + ... + 853140.

It is an arithmetic number, because the mean of its divisors is an integer number (484272540).

Almost surely, 2^21232123110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21232123110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30993442560).

21232123110 is an abundant number, since it is smaller than the sum of its proper divisors (40754762010).

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

21232123110 is a wasteful number, since it uses less digits than its factorization.

21232123110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25571 (or 25565 counting only the distinct ones).

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

Adding to 21232123110 its reverse (1132123212), we get a palindrome (22364246322).

The spelling of 21232123110 in words is "twenty-one billion, two hundred thirty-two million, one hundred twenty-three thousand, one hundred ten".