2715221 has 2 divisors, whose sum is σ = 2715222. Its totient is φ = 2715220.

The previous prime is 2715217. The next prime is 2715247. The reversal of 2715221 is 1225172.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2686321 + 28900 = 1639^2 + 170^2 .

It is a cyclic number.

It is not a de Polignac number, because 2715221 - 2² = 2715217 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2715193 and 2715202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2715211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1357610 + 1357611.

It is an arithmetic number, because the mean of its divisors is an integer number (1357611).

2^2715221 is an apocalyptic number.

It is an amenable number.

2715221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2715221 is an equidigital number, since it uses as much as digits as its factorization.

2715221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 280, while the sum is 20.

The square root of 2715221 is about 1647.7927660965. The cubic root of 2715221 is about 139.5088401107.

The spelling of 2715221 in words is "two million, seven hundred fifteen thousand, two hundred twenty-one".