2112021121221 has 24 divisors (see below), whose sum is σ = 3328469909856. Its totient is φ = 1279844867040.

The previous prime is 2112021121169. The next prime is 2112021121291. The reversal of 2112021121221 is 1221211202112.

2112021121221 is a `hidden beast` number, since 211 + 2 + 0 + 211 + 21 + 221 = 666.

It is not a de Polignac number, because 2112021121221 - 2⁹ = 2112021120709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2112021121194 and 2112021121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112021121291) 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, 638970 + ... + 2152283.

It is an arithmetic number, because the mean of its divisors is an integer number (138686246244).

Almost surely, 2^{2112021121221} is an apocalyptic number.

It is an amenable number.

2112021121221 is a deficient number, since it is larger than the sum of its proper divisors (1216448788635).

2112021121221 is a wasteful number, since it uses less digits than its factorization.

2112021121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2798913 (or 2798910 counting only the distinct ones).

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

Adding to 2112021121221 its reverse (1221211202112), we get a palindrome (3333232323333).

It can be divided in two parts, 211202112 and 1221, that multiplied together give a palindrome (257877778752).

The spelling of 2112021121221 in words is "two trillion, one hundred twelve billion, twenty-one million, one hundred twenty-one thousand, two hundred twenty-one".