2112121012221 has 24 divisors (see below), whose sum is σ = 3329650134720. Its totient is φ = 1279512014400.

The previous prime is 2112121012193. The next prime is 2112121012259. The reversal of 2112121012221 is 1222101212112.

2112121012221 is a `hidden beast` number, since 211 + 21 + 210 + 1 + 2 + 221 = 666.

It is not a de Polignac number, because 2112121012221 - 2⁹ = 2112121011709 is a prime.

It is a super-2 number, since 2×2112121012221² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2112121012194 and 2112121012203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112121019221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4450761 + ... + 4902398.

It is an arithmetic number, because the mean of its divisors is an integer number (138735422280).

Almost surely, 2^{2112121012221} is an apocalyptic number.

It is an amenable number.

2112121012221 is a deficient number, since it is larger than the sum of its proper divisors (1217529122499).

2112121012221 is a wasteful number, since it uses less digits than its factorization.

2112121012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9355457 (or 9355454 counting only the distinct ones).

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

Adding to 2112121012221 its reverse (1222101212112), we get a palindrome (3334222224333).

The spelling of 2112121012221 in words is "two trillion, one hundred twelve billion, one hundred twenty-one million, twelve thousand, two hundred twenty-one".