201221402 has 4 divisors (see below), whose sum is σ = 301832106. Its totient is φ = 100610700.

The previous prime is 201221389. The next prime is 201221417. The reversal of 201221402 is 204122102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 102596641 + 98624761 = 10129^2 + 9931^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50305349 + ... + 50305352.

Almost surely, 2^201221402 is an apocalyptic number.

201221402 is a deficient number, since it is larger than the sum of its proper divisors (100610704).

201221402 is a wasteful number, since it uses less digits than its factorization.

201221402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100610703.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 201221402 is about 14185.2529762426. The cubic root of 201221402 is about 585.9915994711.

Adding to 201221402 its reverse (204122102), we get a palindrome (405343504).

The spelling of 201221402 in words is "two hundred one million, two hundred twenty-one thousand, four hundred two".