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202212121 is a prime number
BaseRepresentation
bin11000000110110…
…00001100011001
3112002111102212211
430003120030121
5403231241441
632022035121
75003526466
oct1403301431
9462442784
10202212121
11a4163a61
1257878aa1
1332b80157
141cbda66d
1512b44a81
hexc0d8319

202212121 has 2 divisors, whose sum is σ = 202212122. Its totient is φ = 202212120.

The previous prime is 202212107. The next prime is 202212139. The reversal of 202212121 is 121212202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202208400 + 3721 = 14220^2 + 61^2 .

It is a cyclic number.

It is not a de Polignac number, because 202212121 - 217 = 202081049 is a prime.

It is not a weakly prime, because it can be changed into another prime (202212151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101106060 + 101106061.

It is an arithmetic number, because the mean of its divisors is an integer number (101106061).

Almost surely, 2202212121 is an apocalyptic number.

It is an amenable number.

202212121 is a deficient number, since it is larger than the sum of its proper divisors (1).

202212121 is an equidigital number, since it uses as much as digits as its factorization.

202212121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 202212121 is about 14220.1308362476. The cubic root of 202212121 is about 586.9517405791.

Adding to 202212121 its reverse (121212202), we get a palindrome (323424323).

The spelling of 202212121 in words is "two hundred two million, two hundred twelve thousand, one hundred twenty-one".