21121220210112 has 84 divisors (see below), whose sum is σ = 66043815487416. Its totient is φ = 6400369758720.

The previous prime is 21121220210099. The next prime is 21121220210143. The reversal of 21121220210112 is 21101202212112.

21121220210112 is a `hidden beast` number, since 2 + 1 + 121 + 220 + 210 + 112 = 666.

It is a super-2 number, since 2×21121220210112² (a number of 27 digits) contains 22 as substring.

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, 1666756623 + ... + 1666769294.

Almost surely, 2^{21121220210112} is an apocalyptic number.

21121220210112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21121220210112 is an abundant number, since it is smaller than the sum of its proper divisors (44922595277304).

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

21121220210112 is a wasteful number, since it uses less digits than its factorization.

21121220210112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333525946 (or 3333525933 counting only the distinct ones).

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

Adding to 21121220210112 its reverse (21101202212112), we get a palindrome (42222422422224).

The spelling of 21121220210112 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twenty million, two hundred ten thousand, one hundred twelve".