201221001011101 has 4 divisors (see below), whose sum is σ = 201800888622432. Its totient is φ = 200641113399772.

The previous prime is 201221001011071. The next prime is 201221001011117. The reversal of 201221001011101 is 101110100122102.

It is a happy number.

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 201221001011101 - 2¹¹ = 201221001009053 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 (201221001011171) 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, 289943805145 + ... + 289943805838.

It is an arithmetic number, because the mean of its divisors is an integer number (50450222155608).

Almost surely, 2^{201221001011101} is an apocalyptic number.

It is an amenable number.

201221001011101 is a deficient number, since it is larger than the sum of its proper divisors (579887611331).

201221001011101 is an equidigital number, since it uses as much as digits as its factorization.

201221001011101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579887611330.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 201221001011101 its reverse (101110100122102), we get a palindrome (302331101133203).

The spelling of 201221001011101 in words is "two hundred one trillion, two hundred twenty-one billion, one million, eleven thousand, one hundred one".