21102121221112 has 16 divisors (see below), whose sum is σ = 39636755232840. Its totient is φ = 10532319825696.

The previous prime is 21102121221067. The next prime is 21102121221157. The reversal of 21102121221112 is 21112212120112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21102121221067) and next prime (21102121221157).

It is a self number, because there is not a number n which added to its sum of digits gives 21102121221112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2342593323 + ... + 2342602330.

Almost surely, 2^{21102121221112} is an apocalyptic number.

It is an amenable number.

21102121221112 is a deficient number, since it is larger than the sum of its proper divisors (18534634011728).

21102121221112 is a wasteful number, since it uses less digits than its factorization.

21102121221112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4685196222 (or 4685196218 counting only the distinct ones).

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

Adding to 21102121221112 its reverse (21112212120112), we get a palindrome (42214333341224).

The spelling of 21102121221112 in words is "twenty-one trillion, one hundred two billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred twelve".