202664221 has 2 divisors, whose sum is σ = 202664222. Its totient is φ = 202664220.

The previous prime is 202664183. The next prime is 202664249. The reversal of 202664221 is 122466202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141276996 + 61387225 = 11886^2 + 7835^2 .

It is a cyclic number.

It is not a de Polignac number, because 202664221 - 2²¹ = 200567069 is a prime.

It is equal to p_11218291 and since 202664221 and 11218291 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202664251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101332110 + 101332111.

It is an arithmetic number, because the mean of its divisors is an integer number (101332111).

Almost surely, 2^202664221 is an apocalyptic number.

It is an amenable number.

202664221 is a deficient number, since it is larger than the sum of its proper divisors (1).

202664221 is an equidigital number, since it uses as much as digits as its factorization.

202664221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 202664221 is about 14236.0184391564. The cubic root of 202664221 is about 587.3888448829.

It can be divided in two parts, 202664 and 221, that multiplied together give a palindrome (44788744).

The spelling of 202664221 in words is "two hundred two million, six hundred sixty-four thousand, two hundred twenty-one".