2124222121 has 4 divisors (see below), whose sum is σ = 2427682432. Its totient is φ = 1820761812.

The previous prime is 2124222103. The next prime is 2124222137. The reversal of 2124222121 is 1212224212.

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 2124222121 - 2¹⁹ = 2123697833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2124222181) 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, 151730145 + ... + 151730158.

It is an arithmetic number, because the mean of its divisors is an integer number (606920608).

Almost surely, 2^2124222121 is an apocalyptic number.

It is an amenable number.

2124222121 is a deficient number, since it is larger than the sum of its proper divisors (303460311).

2124222121 is an equidigital number, since it uses as much as digits as its factorization.

2124222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303460310.

The product of its digits is 256, while the sum is 19.

The square root of 2124222121 is about 46089.2842318038. The cubic root of 2124222121 is about 1285.4839019910.

Adding to 2124222121 its reverse (1212224212), we get a palindrome (3336446333).

The spelling of 2124222121 in words is "two billion, one hundred twenty-four million, two hundred twenty-two thousand, one hundred twenty-one".