201220120222001 has 4 divisors (see below), whose sum is σ = 201400263571572. Its totient is φ = 201039976872432.

The previous prime is 201220120221929. The next prime is 201220120222003. The reversal of 201220120222001 is 100222021022102.

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 2 ways, for example, as 35536859238400 + 165683260983601 = 5961280^2 + 12871801^2 .

It is a cyclic number.

It is not a de Polignac number, because 201220120222001 - 2¹⁸ = 201220119959857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201220120222003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90071673110 + ... + 90071675343.

It is an arithmetic number, because the mean of its divisors is an integer number (50350065892893).

Almost surely, 2^{201220120222001} is an apocalyptic number.

It is an amenable number.

201220120222001 is a deficient number, since it is larger than the sum of its proper divisors (180143349571).

201220120222001 is a wasteful number, since it uses less digits than its factorization.

201220120222001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180143349570.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 201220120222001 its reverse (100222021022102), we get a palindrome (301442141244103).

The spelling of 201220120222001 in words is "two hundred one trillion, two hundred twenty billion, one hundred twenty million, two hundred twenty-two thousand, one".