201221022102013 has 4 divisors (see below), whose sum is σ = 201222624089020. Its totient is φ = 201219420115008.

The previous prime is 201221022101867. The next prime is 201221022102029. The reversal of 201221022102013 is 310201220122102.

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 23667475795929 + 177553546306084 = 4864923^2 + 13324922^2 .

It is a cyclic number.

It is not a de Polignac number, because 201221022102013 - 2³⁷ = 201083583148541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221022108013) 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, 800805078 + ... + 801056311.

It is an arithmetic number, because the mean of its divisors is an integer number (50305656022255).

Almost surely, 2^{201221022102013} is an apocalyptic number.

It is an amenable number.

201221022102013 is a deficient number, since it is larger than the sum of its proper divisors (1601987007).

201221022102013 is a wasteful number, since it uses less digits than its factorization.

201221022102013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601987006.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 201221022102013 its reverse (310201220122102), we get a palindrome (511422242224115).

The spelling of 201221022102013 in words is "two hundred one trillion, two hundred twenty-one billion, twenty-two million, one hundred two thousand, thirteen".