2125122121 has 8 divisors (see below), whose sum is σ = 2219552640. Its totient is φ = 2032638768.

The previous prime is 2125122119. The next prime is 2125122149. The reversal of 2125122121 is 1212215212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2125122121 - 2¹ = 2125122119 is a prime.

It is a super-2 number, since 2×2125122121² = 9032288058327077282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2125122101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 484561 + ... + 488926.

It is an arithmetic number, because the mean of its divisors is an integer number (277444080).

Almost surely, 2^2125122121 is an apocalyptic number.

It is an amenable number.

2125122121 is a deficient number, since it is larger than the sum of its proper divisors (94430519).

2125122121 is an equidigital number, since it uses as much as digits as its factorization.

2125122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973583.

The product of its digits is 160, while the sum is 19.

The square root of 2125122121 is about 46099.0468556564. The cubic root of 2125122121 is about 1285.6654228949.

Adding to 2125122121 its reverse (1212215212), we get a palindrome (3337337333).

The spelling of 2125122121 in words is "two billion, one hundred twenty-five million, one hundred twenty-two thousand, one hundred twenty-one".