201221120012101 has 4 divisors (see below), whose sum is σ = 229966994299552. Its totient is φ = 172475245724652.

The previous prime is 201221120012021. The next prime is 201221120012111. The reversal of 201221120012101 is 101210021122102.

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 201221120012101 - 2¹³ = 201221120003909 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 (201221120012111) 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, 14372937143715 + ... + 14372937143728.

It is an arithmetic number, because the mean of its divisors is an integer number (57491748574888).

Almost surely, 2^{201221120012101} is an apocalyptic number.

It is an amenable number.

201221120012101 is a deficient number, since it is larger than the sum of its proper divisors (28745874287451).

201221120012101 is an equidigital number, since it uses as much as digits as its factorization.

201221120012101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28745874287450.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 201221120012101 its reverse (101210021122102), we get a palindrome (302431141134203).

The spelling of 201221120012101 in words is "two hundred one trillion, two hundred twenty-one billion, one hundred twenty million, twelve thousand, one hundred one".