2507221 has 4 divisors (see below), whose sum is σ = 2639200. Its totient is φ = 2375244.

The previous prime is 2507213. The next prime is 2507227. The reversal of 2507221 is 1227052.

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 2507221 - 2³ = 2507213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 131959 = 2507221 / (2 + 5 + 0 + 7 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2507227) 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, 65961 + ... + 65998.

It is an arithmetic number, because the mean of its divisors is an integer number (659800).

2^2507221 is an apocalyptic number.

It is an amenable number.

2507221 is a deficient number, since it is larger than the sum of its proper divisors (131979).

2507221 is a wasteful number, since it uses less digits than its factorization.

2507221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131978.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 2507221 is about 1583.4206642582. The cubic root of 2507221 is about 135.8514272842.

The spelling of 2507221 in words is "two million, five hundred seven thousand, two hundred twenty-one".