420240121 has 6 divisors (see below), whose sum is σ = 488850810. Its totient is φ = 360205776.

The previous prime is 420240101. The next prime is 420240133. The reversal of 420240121 is 121042024.

It can be written as a sum of positive squares in only one way, i.e., 418652521 + 1587600 = 20461^2 + 1260^2 .

It is not a de Polignac number, because 420240121 - 2⁵ = 420240089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 420240095 and 420240104.

It is not an unprimeable number, because it can be changed into a prime (420240101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4288116 + ... + 4288213.

It is an arithmetic number, because the mean of its divisors is an integer number (81475135).

Almost surely, 2^420240121 is an apocalyptic number.

It is an amenable number.

420240121 is a deficient number, since it is larger than the sum of its proper divisors (68610689).

420240121 is an equidigital number, since it uses as much as digits as its factorization.

420240121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8576343 (or 8576336 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 420240121 is about 20499.7590473644. The cubic root of 420240121 is about 749.0299286378.

Adding to 420240121 its reverse (121042024), we get a palindrome (541282145).

The spelling of 420240121 in words is "four hundred twenty million, two hundred forty thousand, one hundred twenty-one".