201101010221 has 4 divisors (see below), whose sum is σ = 201101907132. Its totient is φ = 201100113312.

The previous prime is 201101010203. The next prime is 201101010233. The reversal of 201101010221 is 122010101102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 122010101102 = 2 ⋅61005050551.

It can be written as a sum of positive squares in 2 ways, for example, as 151823226025 + 49277784196 = 389645^2 + 221986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201101010221 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 (201101012221) 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, 219281 + ... + 671033.

It is an arithmetic number, because the mean of its divisors is an integer number (50275476783).

Almost surely, 2^201101010221 is an apocalyptic number.

It is an amenable number.

201101010221 is a deficient number, since it is larger than the sum of its proper divisors (896911).

201101010221 is an equidigital number, since it uses as much as digits as its factorization.

201101010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 896910.

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

Adding to 201101010221 its reverse (122010101102), we get a palindrome (323111111323).

The spelling of 201101010221 in words is "two hundred one billion, one hundred one million, ten thousand, two hundred twenty-one".