2142121121 has 4 divisors (see below), whose sum is σ = 2448138432. Its totient is φ = 1836103812.

The previous prime is 2142121117. The next prime is 2142121127. The reversal of 2142121121 is 1211212412.

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 2142121121 - 2² = 2142121117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2142121121.

It is not an unprimeable number, because it can be changed into a prime (2142121127) 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, 153008645 + ... + 153008658.

It is an arithmetic number, because the mean of its divisors is an integer number (612034608).

Almost surely, 2^2142121121 is an apocalyptic number.

It is an amenable number.

2142121121 is a deficient number, since it is larger than the sum of its proper divisors (306017311).

2142121121 is an equidigital number, since it uses as much as digits as its factorization.

2142121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306017310.

The product of its digits is 64, while the sum is 17.

The square root of 2142121121 is about 46283.0543611806. The cubic root of 2142121121 is about 1289.0843653648.

Adding to 2142121121 its reverse (1211212412), we get a palindrome (3353333533).

The spelling of 2142121121 in words is "two billion, one hundred forty-two million, one hundred twenty-one thousand, one hundred twenty-one".