21012220112112 has 60 divisors (see below), whose sum is σ = 58810436479704. Its totient is φ = 7003429741440.

The previous prime is 21012220112071. The next prime is 21012220112183. The reversal of 21012220112112 is 21121102221012.

21012220112112 is a `hidden beast` number, since 210 + 12 + 220 + 11 + 211 + 2 = 666.

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, 5130723 + ... + 8267330.

Almost surely, 2^{21012220112112} is an apocalyptic number.

It is an amenable number.

21012220112112 is an abundant number, since it is smaller than the sum of its proper divisors (37798216367592).

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

21012220112112 is a wasteful number, since it uses less digits than its factorization.

21012220112112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13408958 (or 13408949 counting only the distinct ones).

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

Adding to 21012220112112 its reverse (21121102221012), we get a palindrome (42133322333124).

The spelling of 21012220112112 in words is "twenty-one trillion, twelve billion, two hundred twenty million, one hundred twelve thousand, one hundred twelve".