2111220122121 has 24 divisors (see below), whose sum is σ = 3327052588704. Its totient is φ = 1279419082560.

The previous prime is 2111220122119. The next prime is 2111220122173. The reversal of 2111220122121 is 1212210221112.

2111220122121 is a `hidden beast` number, since 211 + 12 + 201 + 221 + 21 = 666.

It is not a de Polignac number, because 2111220122121 - 2¹ = 2111220122119 is a prime.

It is a super-2 number, since 2×2111220122121² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2111220122094 and 2111220122103.

It is not an unprimeable number, because it can be changed into a prime (2111220122191) 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, 281550 + ... + 2074056.

It is an arithmetic number, because the mean of its divisors is an integer number (138627191196).

Almost surely, 2^{2111220122121} is an apocalyptic number.

It is an amenable number.

2111220122121 is a deficient number, since it is larger than the sum of its proper divisors (1215832466583).

2111220122121 is a wasteful number, since it uses less digits than its factorization.

2111220122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1804421 (or 1804418 counting only the distinct ones).

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

Adding to 2111220122121 its reverse (1212210221112), we get a palindrome (3323430343233).

The spelling of 2111220122121 in words is "two trillion, one hundred eleven billion, two hundred twenty million, one hundred twenty-two thousand, one hundred twenty-one".