201021101202221 has 4 divisors (see below), whose sum is σ = 204316529090844. Its totient is φ = 197725673313600.

The previous prime is 201021101202197. The next prime is 201021101202253. The reversal of 201021101202221 is 122202101120102.

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 53374567524100 + 147646533678121 = 7305790^2 + 12150989^2 .

It is a cyclic number.

It is not a de Polignac number, because 201021101202221 - 2²⁶ = 201021034093357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201021101202221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021101202721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1647713944220 + ... + 1647713944341.

It is an arithmetic number, because the mean of its divisors is an integer number (51079132272711).

Almost surely, 2^{201021101202221} is an apocalyptic number.

It is an amenable number.

201021101202221 is a deficient number, since it is larger than the sum of its proper divisors (3295427888623).

201021101202221 is an equidigital number, since it uses as much as digits as its factorization.

201021101202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3295427888622.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 201021101202221 its reverse (122202101120102), we get a palindrome (323223202322323).

The spelling of 201021101202221 in words is "two hundred one trillion, twenty-one billion, one hundred one million, two hundred two thousand, two hundred twenty-one".