21120110310 has 128 divisors (see below), whose sum is σ = 57892786560. Its totient is φ = 4884996096.

The previous prime is 21120110273. The next prime is 21120110317. The reversal of 21120110310 is 1301102112.

It is a super-2 number, since 2×21120110310² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120110317) 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, 4698424 + ... + 4702916.

It is an arithmetic number, because the mean of its divisors is an integer number (452287395).

Almost surely, 2^21120110310 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21120110310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28946393280).

21120110310 is an abundant number, since it is smaller than the sum of its proper divisors (36772676250).

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

21120110310 is a wasteful number, since it uses less digits than its factorization.

21120110310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5242.

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

Adding to 21120110310 its reverse (1301102112), we get a palindrome (22421212422).

The spelling of 21120110310 in words is "twenty-one billion, one hundred twenty million, one hundred ten thousand, three hundred ten".