2402421 has 24 divisors (see below), whose sum is σ = 3803040. Its totient is φ = 1344672.

The previous prime is 2402401. The next prime is 2402431. The reversal of 2402421 is 1242042.

It is not a de Polignac number, because 2402421 - 2⁷ = 2402293 is a prime.

It is a super-2 number, since 2×2402421² = 11543253322482, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2402421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2402401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8535 + ... + 8811.

It is an arithmetic number, because the mean of its divisors is an integer number (158460).

2^2402421 is an apocalyptic number.

2402421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2402421 is a deficient number, since it is larger than the sum of its proper divisors (1400619).

2402421 is a wasteful number, since it uses less digits than its factorization.

2402421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353 (or 346 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 2402421 is about 1549.9745159195. The cubic root of 2402421 is about 133.9315942530.

Adding to 2402421 its reverse (1242042), we get a palindrome (3644463).

The spelling of 2402421 in words is "two million, four hundred two thousand, four hundred twenty-one".