21211120112 has 80 divisors (see below), whose sum is σ = 51190056960. Its totient is φ = 8290066176.

The previous prime is 21211120081. The next prime is 21211120121. The reversal of 21211120112 is 21102111212.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33089 + ... + 208607.

It is an arithmetic number, because the mean of its divisors is an integer number (639875712).

Almost surely, 2^21211120112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21211120112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25595028480).

21211120112 is an abundant number, since it is smaller than the sum of its proper divisors (29978936848).

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

21211120112 is a wasteful number, since it uses less digits than its factorization.

21211120112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175630 (or 175624 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21211120112 its reverse (21102111212), we get a palindrome (42313231324).

The spelling of 21211120112 in words is "twenty-one billion, two hundred eleven million, one hundred twenty thousand, one hundred twelve".