21013120110 has 128 divisors (see below), whose sum is σ = 53643824640. Its totient is φ = 5253120000.

The previous prime is 21013120103. The next prime is 21013120123. The reversal of 21013120110 is 1102131012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 27612130 + ... + 27612890.

It is an arithmetic number, because the mean of its divisors is an integer number (419092380).

Almost surely, 2^21013120110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21013120110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26821912320).

21013120110 is an abundant number, since it is smaller than the sum of its proper divisors (32630704530).

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

21013120110 is a wasteful number, since it uses less digits than its factorization.

21013120110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1234.

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

Adding to 21013120110 its reverse (1102131012), we get a palindrome (22115251122).

The spelling of 21013120110 in words is "twenty-one billion, thirteen million, one hundred twenty thousand, one hundred ten".