2801221 has 2 divisors, whose sum is σ = 2801222. Its totient is φ = 2801220.

The previous prime is 2801219. The next prime is 2801237. The reversal of 2801221 is 1221082.

It is an a-pointer prime, because the next prime (2801237) can be obtained adding 2801221 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2788900 + 12321 = 1670^2 + 111^2 .

It is a cyclic number.

It is not a de Polignac number, because 2801221 - 2¹ = 2801219 is a prime.

Together with 2801219, it forms a pair of twin primes.

2801221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2801195 and 2801204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2801251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1400610 + 1400611.

It is an arithmetic number, because the mean of its divisors is an integer number (1400611).

2^2801221 is an apocalyptic number.

It is an amenable number.

2801221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2801221 is an equidigital number, since it uses as much as digits as its factorization.

2801221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 2801221 is about 1673.6848568354. The cubic root of 2801221 is about 140.9664591682.

The spelling of 2801221 in words is "two million, eight hundred one thousand, two hundred twenty-one".