425220121 has 8 divisors (see below), whose sum is σ = 427740264. Its totient is φ = 422707200.

The previous prime is 425220097. The next prime is 425220157. The reversal of 425220121 is 121022524.

It can be written as a sum of positive squares in 4 ways, for example, as 360240400 + 64979721 = 18980^2 + 8061^2 .

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

It is a 6-Lehmer number, since φ(425220121) divides (425220121-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 425220121 - 2⁹ = 425219609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (425220221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153081 + ... + 155833.

It is an arithmetic number, because the mean of its divisors is an integer number (53467533).

Almost surely, 2^425220121 is an apocalyptic number.

It is an amenable number.

425220121 is a deficient number, since it is larger than the sum of its proper divisors (2520143).

425220121 is a wasteful number, since it uses less digits than its factorization.

425220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3611.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 425220121 is about 20620.8661554262. The cubic root of 425220121 is about 751.9770775654.

Adding to 425220121 its reverse (121022524), we get a palindrome (546242645).

The spelling of 425220121 in words is "four hundred twenty-five million, two hundred twenty thousand, one hundred twenty-one".