2520221 has 8 divisors (see below), whose sum is σ = 2765664. Its totient is φ = 2277520.

The previous prime is 2520211. The next prime is 2520241. The reversal of 2520221 is 1220252.

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 2520221 - 2¹⁰ = 2519197 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2520196 and 2520205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2520211) 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, 1586 + ... + 2748.

It is an arithmetic number, because the mean of its divisors is an integer number (345708).

2^2520221 is an apocalyptic number.

It is an amenable number.

2520221 is a deficient number, since it is larger than the sum of its proper divisors (245443).

2520221 is a wasteful number, since it uses less digits than its factorization.

2520221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 2520221 is about 1587.5203935698. The cubic root of 2520221 is about 136.0858202566.

Adding to 2520221 its reverse (1220252), we get a palindrome (3740473).

The spelling of 2520221 in words is "two million, five hundred twenty thousand, two hundred twenty-one".