2506221 has 10 divisors (see below), whose sum is σ = 3743982. Its totient is φ = 1670760.

The previous prime is 2506201. The next prime is 2506223. The reversal of 2506221 is 1226052.

It can be written as a sum of positive squares in only one way, i.e., 1920996 + 585225 = 1386^2 + 765^2 .

It is not a de Polignac number, because 2506221 - 2¹⁵ = 2473453 is a prime.

It is a super-2 number, since 2×2506221² = 12562287401682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2506194 and 2506203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2506223) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 15390 + ... + 15551.

2^2506221 is an apocalyptic number.

It is an amenable number.

2506221 is a deficient number, since it is larger than the sum of its proper divisors (1237761).

2506221 is an equidigital number, since it uses as much as digits as its factorization.

2506221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30953 (or 30944 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 2506221 is about 1583.1048607089. The cubic root of 2506221 is about 135.8333635272.

The spelling of 2506221 in words is "two million, five hundred six thousand, two hundred twenty-one".