2521421 has 8 divisors (see below), whose sum is σ = 3007104. Its totient is φ = 2067120.

The previous prime is 2521417. The next prime is 2521429. The reversal of 2521421 is 1241252.

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

It is a cyclic number.

It is not a de Polignac number, because 2521421 - 2² = 2521417 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2521421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521429) 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, 7670 + ... + 7991.

It is an arithmetic number, because the mean of its divisors is an integer number (375888).

2^2521421 is an apocalyptic number.

It is an amenable number.

2521421 is a deficient number, since it is larger than the sum of its proper divisors (485683).

2521421 is a wasteful number, since it uses less digits than its factorization.

2521421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15691.

The product of its digits is 160, while the sum is 17.

The square root of 2521421 is about 1587.8982964913. The cubic root of 2521421 is about 136.1074158591.

Adding to 2521421 its reverse (1241252), we get a palindrome (3762673).

The spelling of 2521421 in words is "two million, five hundred twenty-one thousand, four hundred twenty-one".