21212010221112 has 48 divisors (see below), whose sum is σ = 58422909519000. Its totient is φ = 6950828206656.

The previous prime is 21212010221111. The next prime is 21212010221203. The reversal of 21212010221112 is 21112201021212.

21212010221112 is a `hidden beast` number, since 212 + 120 + 1 + 0 + 221 + 112 = 666.

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 (21212010221111) 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, 2496701287 + ... + 2496709782.

Almost surely, 2^{21212010221112} is an apocalyptic number.

It is an amenable number.

21212010221112 is an abundant number, since it is smaller than the sum of its proper divisors (37210899297888).

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

21212010221112 is a wasteful number, since it uses less digits than its factorization.

21212010221112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4993411140 (or 4993411133 counting only the distinct ones).

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

Adding to 21212010221112 its reverse (21112201021212), we get a palindrome (42324211242324).

The spelling of 21212010221112 in words is "twenty-one trillion, two hundred twelve billion, ten million, two hundred twenty-one thousand, one hundred twelve".