201101210221 has 4 divisors (see below), whose sum is σ = 204895572732. Its totient is φ = 197306847712.

The previous prime is 201101210209. The next prime is 201101210249. The reversal of 201101210221 is 122012101102.

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 66404136100 + 134697074121 = 257690^2 + 367011^2 .

It is a cyclic number.

It is not a de Polignac number, because 201101210221 - 2⁹ = 201101209709 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 (201101210021) 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, 1897181176 + ... + 1897181281.

It is an arithmetic number, because the mean of its divisors is an integer number (51223893183).

Almost surely, 2^201101210221 is an apocalyptic number.

It is an amenable number.

201101210221 is a deficient number, since it is larger than the sum of its proper divisors (3794362511).

201101210221 is an equidigital number, since it uses as much as digits as its factorization.

201101210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3794362510.

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

Adding to 201101210221 its reverse (122012101102), we get a palindrome (323113311323).

The spelling of 201101210221 in words is "two hundred one billion, one hundred one million, two hundred ten thousand, two hundred twenty-one".