201221211310013 has 4 divisors (see below), whose sum is σ = 201320481766560. Its totient is φ = 201121940853468.

The previous prime is 201221211309997. The next prime is 201221211310061. The reversal of 201221211310013 is 310013112122102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201221211310013 - 2⁴ = 201221211309997 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 (201221211310313) 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, 49635225233 + ... + 49635229286.

It is an arithmetic number, because the mean of its divisors is an integer number (50330120441640).

Almost surely, 2^{201221211310013} is an apocalyptic number.

It is an amenable number.

201221211310013 is a deficient number, since it is larger than the sum of its proper divisors (99270456547).

201221211310013 is an equidigital number, since it uses as much as digits as its factorization.

201221211310013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99270456546.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 201221211310013 its reverse (310013112122102), we get a palindrome (511234323432115).

The spelling of 201221211310013 in words is "two hundred one trillion, two hundred twenty-one billion, two hundred eleven million, three hundred ten thousand, thirteen".