402201221 has 2 divisors, whose sum is σ = 402201222. Its totient is φ = 402201220.

The previous prime is 402201209. The next prime is 402201227. The reversal of 402201221 is 122102204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 374848321 + 27352900 = 19361^2 + 5230^2 .

It is a cyclic number.

It is not a de Polignac number, because 402201221 - 2⁶ = 402201157 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 402201196 and 402201205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402201227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201100610 + 201100611.

It is an arithmetic number, because the mean of its divisors is an integer number (201100611).

Almost surely, 2^402201221 is an apocalyptic number.

It is an amenable number.

402201221 is a deficient number, since it is larger than the sum of its proper divisors (1).

402201221 is an equidigital number, since it uses as much as digits as its factorization.

402201221 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 14.

The square root of 402201221 is about 20054.9550236344. The cubic root of 402201221 is about 738.1553892924.

Adding to 402201221 its reverse (122102204), we get a palindrome (524303425).

The spelling of 402201221 in words is "four hundred two million, two hundred one thousand, two hundred twenty-one".