201001022211221 has 4 divisors (see below), whose sum is σ = 201001644680172. Its totient is φ = 201000399742272.

The previous prime is 201001022211167. The next prime is 201001022211259. The reversal of 201001022211221 is 122112220100102.

201001022211221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 85492029516100 + 115508992695121 = 9246190^2 + 10747511^2 .

It is a cyclic number.

It is not a de Polignac number, because 201001022211221 - 2¹⁴ = 201001022194837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 201001022211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201001022211421) 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, 310749860 + ... + 311396013.

It is an arithmetic number, because the mean of its divisors is an integer number (50250411170043).

Almost surely, 2^{201001022211221} is an apocalyptic number.

It is an amenable number.

201001022211221 is a deficient number, since it is larger than the sum of its proper divisors (622468951).

201001022211221 is an equidigital number, since it uses as much as digits as its factorization.

201001022211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622468950.

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

Adding to 201001022211221 its reverse (122112220100102), we get a palindrome (323113242311323).

The spelling of 201001022211221 in words is "two hundred one trillion, one billion, twenty-two million, two hundred eleven thousand, two hundred twenty-one".