2122012111221 has 24 divisors (see below), whose sum is σ = 3235696100000. Its totient is φ = 1336377971232.

The previous prime is 2122012111211. The next prime is 2122012111223. The reversal of 2122012111221 is 1221112102212.

2122012111221 is a `hidden beast` number, since 212 + 20 + 1 + 211 + 1 + 221 = 666.

It is not a de Polignac number, because 2122012111221 - 2³⁰ = 2120938369397 is a prime.

It is a super-2 number, since 2×2122012111221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2122012111194 and 2122012111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122012111223) 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, 17718871 + ... + 17838228.

Almost surely, 2^{2122012111221} is an apocalyptic number.

It is an amenable number.

2122012111221 is a deficient number, since it is larger than the sum of its proper divisors (1113683988779).

2122012111221 is a wasteful number, since it uses less digits than its factorization.

2122012111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35557473 (or 35557470 counting only the distinct ones).

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

Adding to 2122012111221 its reverse (1221112102212), we get a palindrome (3343124213433).

Subtracting from 2122012111221 its reverse (1221112102212), we obtain a palindrome (900900009009).

The spelling of 2122012111221 in words is "two trillion, one hundred twenty-two billion, twelve million, one hundred eleven thousand, two hundred twenty-one".