21101032110 has 64 divisors (see below), whose sum is σ = 52232408064. Its totient is φ = 5452656000.

The previous prime is 21101032097. The next prime is 21101032129. The reversal of 21101032110 is 1123010112.

It is a super-2 number, since 2×21101032110² (a number of 21 digits) contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 68325 + ... + 216495.

It is an arithmetic number, because the mean of its divisors is an integer number (816131376).

Almost surely, 2^21101032110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21101032110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26116204032).

21101032110 is an abundant number, since it is smaller than the sum of its proper divisors (31131375954).

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

21101032110 is a wasteful number, since it uses less digits than its factorization.

21101032110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148329.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21101032110 its reverse (1123010112), we get a palindrome (22224042222).

The spelling of 21101032110 in words is "twenty-one billion, one hundred one million, thirty-two thousand, one hundred ten".