20011221202201 has 4 divisors (see below), whose sum is σ = 21188351861172. Its totient is φ = 18834090543232.

The previous prime is 20011221202177. The next prime is 20011221202211. The reversal of 20011221202201 is 10220212211002.

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 12636460848400 + 7374760353801 = 3554780^2 + 2715651^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011221202201 - 2¹¹ = 20011221200153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011221202211) 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, 588565329460 + ... + 588565329493.

It is an arithmetic number, because the mean of its divisors is an integer number (5297087965293).

Almost surely, 2^{20011221202201} is an apocalyptic number.

It is an amenable number.

20011221202201 is a deficient number, since it is larger than the sum of its proper divisors (1177130658971).

20011221202201 is a wasteful number, since it uses less digits than its factorization.

20011221202201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177130658970.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20011221202201 its reverse (10220212211002), we get a palindrome (30231433413203).

The spelling of 20011221202201 in words is "twenty trillion, eleven billion, two hundred twenty-one million, two hundred two thousand, two hundred one".