21223132110 has 32 divisors (see below), whose sum is σ = 56595019680. Its totient is φ = 5659501824.

The previous prime is 21223132109. The next prime is 21223132123. The reversal of 21223132110 is 1123132212.

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 15 ways as a sum of consecutive naturals, for example, 39301827 + ... + 39302366.

It is an arithmetic number, because the mean of its divisors is an integer number (1768594365).

Almost surely, 2^21223132110 is an apocalyptic number.

21223132110 is an abundant number, since it is smaller than the sum of its proper divisors (35371887570).

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

21223132110 is a wasteful number, since it uses less digits than its factorization.

21223132110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78604209 (or 78604203 counting only the distinct ones).

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

Adding to 21223132110 its reverse (1123132212), we get a palindrome (22346264322).

The spelling of 21223132110 in words is "twenty-one billion, two hundred twenty-three million, one hundred thirty-two thousand, one hundred ten".