21102221121112 has 32 divisors (see below), whose sum is σ = 39712959483120. Its totient is φ = 10512128747520.

The previous prime is 21102221121101. The next prime is 21102221121143. The reversal of 21102221121112 is 21112112220112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21102221121112.

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, 3718728 + ... + 7485544.

Almost surely, 2^{21102221121112} is an apocalyptic number.

It is an amenable number.

21102221121112 is a deficient number, since it is larger than the sum of its proper divisors (18610738362008).

21102221121112 is a wasteful number, since it uses less digits than its factorization.

21102221121112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3769411 (or 3769407 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21102221121112 its reverse (21112112220112), we get a palindrome (42214333341224).

The spelling of 21102221121112 in words is "twenty-one trillion, one hundred two billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred twelve".