2021212211121 has 16 divisors (see below), whose sum is σ = 3151987854400. Its totient is φ = 1276555080384.

The previous prime is 2021212211111. The next prime is 2021212211141. The reversal of 2021212211121 is 1211122121202.

2021212211121 is a `hidden beast` number, since 202 + 121 + 221 + 1 + 121 = 666.

It is not a de Polignac number, because 2021212211121 - 2¹⁹ = 2021211686833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021212211094 and 2021212211103.

It is not an unprimeable number, because it can be changed into a prime (2021212211111) 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, 1969991896 + ... + 1969992921.

It is an arithmetic number, because the mean of its divisors is an integer number (196999240900).

Almost surely, 2^{2021212211121} is an apocalyptic number.

It is an amenable number.

2021212211121 is a deficient number, since it is larger than the sum of its proper divisors (1130775643279).

2021212211121 is a wasteful number, since it uses less digits than its factorization.

2021212211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3939984845 (or 3939984839 counting only the distinct ones).

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

Adding to 2021212211121 its reverse (1211122121202), we get a palindrome (3232334332323).

The spelling of 2021212211121 in words is "two trillion, twenty-one billion, two hundred twelve million, two hundred eleven thousand, one hundred twenty-one".