201201011221 has 4 divisors (see below), whose sum is σ = 229944012832. Its totient is φ = 172458009612.

The previous prime is 201201011159. The next prime is 201201011239. The reversal of 201201011221 is 122110102102.

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 not a de Polignac number, because 201201011221 - 2⁷ = 201201011093 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 (201201011521) 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, 14371500795 + ... + 14371500808.

It is an arithmetic number, because the mean of its divisors is an integer number (57486003208).

Almost surely, 2^201201011221 is an apocalyptic number.

It is an amenable number.

201201011221 is a deficient number, since it is larger than the sum of its proper divisors (28743001611).

201201011221 is an equidigital number, since it uses as much as digits as its factorization.

201201011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28743001610.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 201201011221 its reverse (122110102102), we get a palindrome (323311113323).

The spelling of 201201011221 in words is "two hundred one billion, two hundred one million, eleven thousand, two hundred twenty-one".