21112021122012 has 36 divisors (see below), whose sum is σ = 53447478924840. Its totient is φ = 7026661549152.

The previous prime is 21112021122011. The next prime is 21112021122047. The reversal of 21112021122012 is 21022112021112.

21112021122012 is a `hidden beast` number, since 211 + 1 + 20 + 211 + 220 + 1 + 2 = 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 not an unprimeable number, because it can be changed into a prime (21112021122011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 444926983 + ... + 444974430.

Almost surely, 2^{21112021122012} is an apocalyptic number.

It is an amenable number.

21112021122012 is an abundant number, since it is smaller than the sum of its proper divisors (32335457802828).

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

21112021122012 is a wasteful number, since it uses less digits than its factorization.

21112021122012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889902082 (or 889902077 counting only the distinct ones).

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

Adding to 21112021122012 its reverse (21022112021112), we get a palindrome (42134133143124).

The spelling of 21112021122012 in words is "twenty-one trillion, one hundred twelve billion, twenty-one million, one hundred twenty-two thousand, twelve".