2520421 has 4 divisors (see below), whose sum is σ = 2563200. Its totient is φ = 2477644.

The previous prime is 2520383. The next prime is 2520431. The reversal of 2520421 is 1240252.

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 a cyclic number.

It is not a de Polignac number, because 2520421 - 2¹³ = 2512229 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2520395 and 2520404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2520431) 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, 21301 + ... + 21418.

It is an arithmetic number, because the mean of its divisors is an integer number (640800).

2^2520421 is an apocalyptic number.

It is an amenable number.

2520421 is a deficient number, since it is larger than the sum of its proper divisors (42779).

2520421 is an equidigital number, since it uses as much as digits as its factorization.

2520421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42778.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 2520421 is about 1587.5833836369. The cubic root of 2520421 is about 136.0894199997.

Adding to 2520421 its reverse (1240252), we get a palindrome (3760673).

The spelling of 2520421 in words is "two million, five hundred twenty thousand, four hundred twenty-one".