2129121 has 12 divisors (see below), whose sum is σ = 3237520. Its totient is φ = 1344600.

The previous prime is 2129119. The next prime is 2129123. The reversal of 2129121 is 1219212.

It is an interprime number because it is at equal distance from previous prime (2129119) and next prime (2129123).

It is not a de Polignac number, because 2129121 - 2¹ = 2129119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2129094 and 2129103.

It is not an unprimeable number, because it can be changed into a prime (2129123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6055 + ... + 6396.

2^2129121 is an apocalyptic number.

It is an amenable number.

2129121 is a deficient number, since it is larger than the sum of its proper divisors (1108399).

2129121 is a wasteful number, since it uses less digits than its factorization.

2129121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12476 (or 12473 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 2129121 is about 1459.1507804199. The cubic root of 2129121 is about 128.6471337216.

Subtracting from 2129121 its reverse (1219212), we obtain a palindrome (909909).

It can be divided in two parts, 21291 and 21, that added together give a palindrome (21312).

The spelling of 2129121 in words is "two million, one hundred twenty-nine thousand, one hundred twenty-one".