2421257 has 4 divisors (see below), whose sum is σ = 2430276. Its totient is φ = 2412240.

The previous prime is 2421253. The next prime is 2421277. The reversal of 2421257 is 7521242.

It is a happy number.

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 430336 + 1990921 = 656^2 + 1411^2 .

It is a cyclic number.

It is not a de Polignac number, because 2421257 - 2² = 2421253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2421253) 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, 4094 + ... + 4647.

It is an arithmetic number, because the mean of its divisors is an integer number (607569).

2^2421257 is an apocalyptic number.

It is an amenable number.

2421257 is a deficient number, since it is larger than the sum of its proper divisors (9019).

2421257 is an equidigital number, since it uses as much as digits as its factorization.

2421257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9018.

The product of its digits is 1120, while the sum is 23.

The square root of 2421257 is about 1556.0388812623. The cubic root of 2421257 is about 134.2807102729.

Adding to 2421257 its reverse (7521242), we get a palindrome (9942499).

The spelling of 2421257 in words is "two million, four hundred twenty-one thousand, two hundred fifty-seven".