425212121 has 4 divisors (see below), whose sum is σ = 429422244. Its totient is φ = 421002000.

The previous prime is 425212097. The next prime is 425212127. The reversal of 425212121 is 121212524.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 305550400 + 119661721 = 17480^2 + 10939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-425212121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 425212093 and 425212102.

It is not an unprimeable number, because it can be changed into a prime (425212127) 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, 2104910 + ... + 2105111.

It is an arithmetic number, because the mean of its divisors is an integer number (107355561).

Almost surely, 2^425212121 is an apocalyptic number.

It is an amenable number.

425212121 is a deficient number, since it is larger than the sum of its proper divisors (4210123).

425212121 is a wasteful number, since it uses less digits than its factorization.

425212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4210122.

The product of its digits is 320, while the sum is 20.

The square root of 425212121 is about 20620.6721762410. The cubic root of 425212121 is about 751.9723616908.

Adding to 425212121 its reverse (121212524), we get a palindrome (546424645).

The spelling of 425212121 in words is "four hundred twenty-five million, two hundred twelve thousand, one hundred twenty-one".