21120220111212 has 36 divisors (see below), whose sum is σ = 53387399632840. Its totient is φ = 7040050085952.

The previous prime is 21120220111189. The next prime is 21120220111273. The reversal of 21120220111212 is 21211102202112.

21120220111212 is a `hidden beast` number, since 2 + 1 + 120 + 220 + 111 + 212 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12706839 + ... + 14272497.

Almost surely, 2^{21120220111212} is an apocalyptic number.

It is an amenable number.

21120220111212 is an abundant number, since it is smaller than the sum of its proper divisors (32267179521628).

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

21120220111212 is a wasteful number, since it uses less digits than its factorization.

21120220111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1940382 (or 1940377 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21120220111212 its reverse (21211102202112), we get a palindrome (42331322313324).

The spelling of 21120220111212 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty million, one hundred eleven thousand, two hundred twelve".