2421381 has 4 divisors (see below), whose sum is σ = 3228512. Its totient is φ = 1614252.

The previous prime is 2421347. The next prime is 2421383. The reversal of 2421381 is 1831242.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2421381 - 2⁷ = 2421253 is a prime.

It is a super-2 number, since 2×2421381² = 11726171894322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2421383) 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, 403561 + ... + 403566.

It is an arithmetic number, because the mean of its divisors is an integer number (807128).

2^2421381 is an apocalyptic number.

It is an amenable number.

2421381 is a deficient number, since it is larger than the sum of its proper divisors (807131).

2421381 is an equidigital number, since it uses as much as digits as its factorization.

2421381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807130.

The product of its digits is 384, while the sum is 21.

The square root of 2421381 is about 1556.0787255149. The cubic root of 2421381 is about 134.2830025428.

The spelling of 2421381 in words is "two million, four hundred twenty-one thousand, three hundred eighty-one".