21202120110 has 64 divisors (see below), whose sum is σ = 53381306880. Its totient is φ = 5382034560.

The previous prime is 21202120091. The next prime is 21202120117. The reversal of 21202120110 is 1102120212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202120117) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109852 + ... + 233391.

It is an arithmetic number, because the mean of its divisors is an integer number (834082920).

Almost surely, 2^21202120110 is an apocalyptic number.

21202120110 is an abundant number, since it is smaller than the sum of its proper divisors (32179186770).

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

21202120110 is a wasteful number, since it uses less digits than its factorization.

21202120110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343353.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21202120110 its reverse (1102120212), we get a palindrome (22304240322).

The spelling of 21202120110 in words is "twenty-one billion, two hundred two million, one hundred twenty thousand, one hundred ten".