2420521 has 4 divisors (see below), whose sum is σ = 2427732. Its totient is φ = 2413312.

The previous prime is 2420519. The next prime is 2420531. The reversal of 2420521 is 1250242.

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 346921 + 2073600 = 589^2 + 1440^2 .

It is a cyclic number.

It is not a de Polignac number, because 2420521 - 2¹ = 2420519 is a prime.

It is a super-2 number, since 2×2420521² = 11717843822882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2420495 and 2420504.

It is not an unprimeable number, because it can be changed into a prime (2420531) 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, 3076 + ... + 3781.

It is an arithmetic number, because the mean of its divisors is an integer number (606933).

2^2420521 is an apocalyptic number.

It is an amenable number.

2420521 is a deficient number, since it is larger than the sum of its proper divisors (7211).

2420521 is an equidigital number, since it uses as much as digits as its factorization.

2420521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7210.

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

The square root of 2420521 is about 1555.8023653408. The cubic root of 2420521 is about 134.2671029306.

Adding to 2420521 its reverse (1250242), we get a palindrome (3670763).

The spelling of 2420521 in words is "two million, four hundred twenty thousand, five hundred twenty-one".