21110211112212 has 108 divisors (see below), whose sum is σ = 57840378231636. Its totient is φ = 6486209809920.

The previous prime is 21110211112201. The next prime is 21110211112213. The reversal of 21110211112212 is 21221111201112.

It is a happy number.

21110211112212 is a `hidden beast` number, since 21 + 110 + 211 + 112 + 212 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8748841128336 + 12361369983876 = 2957844^2 + 3515874^2 .

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 (21110211112213) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 21469989 + ... + 22431692.

Almost surely, 2^{21110211112212} is an apocalyptic number.

It is an amenable number.

21110211112212 is an abundant number, since it is smaller than the sum of its proper divisors (36730167119424).

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

21110211112212 is a wasteful number, since it uses less digits than its factorization.

21110211112212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43901766 (or 43901742 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21110211112212 its reverse (21221111201112), we get a palindrome (42331322313324).

The spelling of 21110211112212 in words is "twenty-one trillion, one hundred ten billion, two hundred eleven million, one hundred twelve thousand, two hundred twelve".