20201220221201 has 4 divisors (see below), whose sum is σ = 20201414133732. Its totient is φ = 20201026308672.

The previous prime is 20201220221197. The next prime is 20201220221207. The reversal of 20201220221201 is 10212202210202.

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 8945034180625 + 11256186040576 = 2990825^2 + 3355024^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201220221201 - 2² = 20201220221197 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 20201220221201.

It is not an unprimeable number, because it can be changed into a prime (20201220221207) 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, 96799916 + ... + 97008381.

It is an arithmetic number, because the mean of its divisors is an integer number (5050353533433).

Almost surely, 2^{20201220221201} is an apocalyptic number.

It is an amenable number.

20201220221201 is a deficient number, since it is larger than the sum of its proper divisors (193912531).

20201220221201 is a wasteful number, since it uses less digits than its factorization.

20201220221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193912530.

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

Adding to 20201220221201 its reverse (10212202210202), we get a palindrome (30413422431403).

The spelling of 20201220221201 in words is "twenty trillion, two hundred one billion, two hundred twenty million, two hundred twenty-one thousand, two hundred one".