201001221101 has 4 divisors (see below), whose sum is σ = 201029423100. Its totient is φ = 200973019104.

The previous prime is 201001221011. The next prime is 201001221137. The reversal of 201001221101 is 101122100102.

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 83074227076 + 117926994025 = 288226^2 + 343405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201001221101 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 (201001221401) 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, 14090306 + ... + 14104563.

It is an arithmetic number, because the mean of its divisors is an integer number (50257355775).

Almost surely, 2^201001221101 is an apocalyptic number.

It is an amenable number.

201001221101 is a deficient number, since it is larger than the sum of its proper divisors (28201999).

201001221101 is an equidigital number, since it uses as much as digits as its factorization.

201001221101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28201998.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 201001221101 its reverse (101122100102), we get a palindrome (302123321203).

The spelling of 201001221101 in words is "two hundred one billion, one million, two hundred twenty-one thousand, one hundred one".