201122221000021 has 4 divisors (see below), whose sum is σ = 202902063663852. Its totient is φ = 199342378336192.

The previous prime is 201122220999979. The next prime is 201122221000037. The reversal of 201122221000021 is 120000122221102.

It is a happy number.

201122221000021 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 22592244796900 + 178529976203121 = 4753130^2 + 13361511^2 .

It is a cyclic number.

It is not a de Polignac number, because 201122221000021 - 2¹⁵ = 201122220967253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201122220999959 and 201122221000004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201122221400021) 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, 889921331746 + ... + 889921331971.

It is an arithmetic number, because the mean of its divisors is an integer number (50725515915963).

Almost surely, 2^{201122221000021} is an apocalyptic number.

It is an amenable number.

201122221000021 is a deficient number, since it is larger than the sum of its proper divisors (1779842663831).

201122221000021 is a wasteful number, since it uses less digits than its factorization.

201122221000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1779842663830.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 201122221000021 its reverse (120000122221102), we get a palindrome (321122343221123).

The spelling of 201122221000021 in words is "two hundred one trillion, one hundred twenty-two billion, two hundred twenty-one million, twenty-one", and thus it is an aban number.