2121122022121 has 4 divisors (see below), whose sum is σ = 2132971866000. Its totient is φ = 2109272178244.

The previous prime is 2121122022113. The next prime is 2121122022127. The reversal of 2121122022121 is 1212202211212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2121122022121 - 2³ = 2121122022113 is a prime.

It is a super-3 number, since 3×2121122022121³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121122022127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5924921671 + ... + 5924922028.

It is an arithmetic number, because the mean of its divisors is an integer number (533242966500).

Almost surely, 2^{2121122022121} is an apocalyptic number.

It is an amenable number.

2121122022121 is a deficient number, since it is larger than the sum of its proper divisors (11849843879).

2121122022121 is a wasteful number, since it uses less digits than its factorization.

2121122022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11849843878.

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

Adding to 2121122022121 its reverse (1212202211212), we get a palindrome (3333324233333).

The spelling of 2121122022121 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-two million, twenty-two thousand, one hundred twenty-one".