2021112121 has 4 divisors (see below), whose sum is σ = 2309842432. Its totient is φ = 1732381812.

The previous prime is 2021112103. The next prime is 2021112127. The reversal of 2021112121 is 1212111202.

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 not a de Polignac number, because 2021112121 - 2¹⁵ = 2021079353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021112127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144365145 + ... + 144365158.

It is an arithmetic number, because the mean of its divisors is an integer number (577460608).

Almost surely, 2^2021112121 is an apocalyptic number.

It is an amenable number.

2021112121 is a deficient number, since it is larger than the sum of its proper divisors (288730311).

2021112121 is an equidigital number, since it uses as much as digits as its factorization.

2021112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288730310.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 2021112121 is about 44956.7805898065. The cubic root of 2021112121 is about 1264.3388090666.

Adding to 2021112121 its reverse (1212111202), we get a palindrome (3233223323).

The spelling of 2021112121 in words is "two billion, twenty-one million, one hundred twelve thousand, one hundred twenty-one".