201221929 has 2 divisors, whose sum is σ = 201221930. Its totient is φ = 201221928.

The previous prime is 201221921. The next prime is 201221939. The reversal of 201221929 is 929122102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119355625 + 81866304 = 10925^2 + 9048^2 .

It is a cyclic number.

It is not a de Polignac number, because 201221929 - 2³ = 201221921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201221897 and 201221906.

It is not a weakly prime, because it can be changed into another prime (201221921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610964 + 100610965.

It is an arithmetic number, because the mean of its divisors is an integer number (100610965).

Almost surely, 2^201221929 is an apocalyptic number.

It is an amenable number.

201221929 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221929 is an equidigital number, since it uses as much as digits as its factorization.

201221929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 201221929 is about 14185.2715518597. The cubic root of 201221929 is about 585.9921110424.

The spelling of 201221929 in words is "two hundred one million, two hundred twenty-one thousand, nine hundred twenty-nine".