2112202121221 has 16 divisors (see below), whose sum is σ = 2152417397760. Its totient is φ = 2072287002240.

The previous prime is 2112202121177. The next prime is 2112202121257. The reversal of 2112202121221 is 1221212022112.

It is a cyclic number.

It is not a de Polignac number, because 2112202121221 - 2¹⁷ = 2112201990149 is a prime.

It is a super-2 number, since 2×2112202121221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112202121261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32371596 + ... + 32436778.

It is an arithmetic number, because the mean of its divisors is an integer number (134526087360).

Almost surely, 2^{2112202121221} is an apocalyptic number.

It is an amenable number.

2112202121221 is a deficient number, since it is larger than the sum of its proper divisors (40215276539).

2112202121221 is a wasteful number, since it uses less digits than its factorization.

2112202121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67476.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 2112202121221 its reverse (1221212022112), we get a palindrome (3333414143333).

The spelling of 2112202121221 in words is "two trillion, one hundred twelve billion, two hundred two million, one hundred twenty-one thousand, two hundred twenty-one".