201222121221001 has 4 divisors (see below), whose sum is σ = 201224211524100. Its totient is φ = 201220030917904.

The previous prime is 201222121220993. The next prime is 201222121221007. The reversal of 201222121221001 is 100122121222102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 188808485377600 + 12413635843401 = 13740760^2 + 3523299^2 .

It is a cyclic number.

It is not a de Polignac number, because 201222121221001 - 2³ = 201222121220993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201222121221001.

It is not an unprimeable number, because it can be changed into a prime (201222121221007) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1045007146 + ... + 1045199683.

It is an arithmetic number, because the mean of its divisors is an integer number (50306052881025).

Almost surely, 2^{201222121221001} is an apocalyptic number.

It is an amenable number.

201222121221001 is a deficient number, since it is larger than the sum of its proper divisors (2090303099).

201222121221001 is an equidigital number, since it uses as much as digits as its factorization.

201222121221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2090303098.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 201222121221001 its reverse (100122121222102), we get a palindrome (301344242443103).

The spelling of 201222121221001 in words is "two hundred one trillion, two hundred twenty-two billion, one hundred twenty-one million, two hundred twenty-one thousand, one".