21120111102 has 16 divisors (see below), whose sum is σ = 43138950912. Its totient is φ = 6890248920.

The previous prime is 21120111071. The next prime is 21120111121. The reversal of 21120111102 is 20111102112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37446724 + ... + 37447287.

It is an arithmetic number, because the mean of its divisors is an integer number (2696184432).

Almost surely, 2^21120111102 is an apocalyptic number.

21120111102 is an abundant number, since it is smaller than the sum of its proper divisors (22018839810).

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

21120111102 is a wasteful number, since it uses less digits than its factorization.

21120111102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74894063.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21120111102 its reverse (20111102112), we get a palindrome (41231213214).

The spelling of 21120111102 in words is "twenty-one billion, one hundred twenty million, one hundred eleven thousand, one hundred two".