201221000122 has 4 divisors (see below), whose sum is σ = 301831500186. Its totient is φ = 100610500060.

The previous prime is 201221000081. The next prime is 201221000131. The reversal of 201221000122 is 221000122102.

It is a happy number.

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., 147817949841 + 53403050281 = 384471^2 + 231091^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50305250029 + ... + 50305250032.

Almost surely, 2^201221000122 is an apocalyptic number.

201221000122 is a deficient number, since it is larger than the sum of its proper divisors (100610500064).

201221000122 is a wasteful number, since it uses less digits than its factorization.

201221000122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100610500063.

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

Adding to 201221000122 its reverse (221000122102), we get a palindrome (422221122224).

The spelling of 201221000122 in words is "two hundred one billion, two hundred twenty-one million, one hundred twenty-two", and thus it is an aban number.