21112012201212 has 36 divisors (see below), whose sum is σ = 55087974492096. Its totient is φ = 6810326516160.

The previous prime is 21112012201183. The next prime is 21112012201253. The reversal of 21112012201212 is 21210221021112.

21112012201212 is a `hidden beast` number, since 21 + 11 + 201 + 220 + 1 + 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 a congruent number.

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, 9458785713 + ... + 9458787944.

Almost surely, 2^{21112012201212} is an apocalyptic number.

It is an amenable number.

21112012201212 is an abundant number, since it is smaller than the sum of its proper divisors (33975962290884).

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

21112012201212 is a wasteful number, since it uses less digits than its factorization.

21112012201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18917573698 (or 18917573693 counting only the distinct ones).

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

Adding to 21112012201212 its reverse (21210221021112), we get a palindrome (42322233222324).

The spelling of 21112012201212 in words is "twenty-one trillion, one hundred twelve billion, twelve million, two hundred one thousand, two hundred twelve".