21220022120201 has 4 divisors (see below), whose sum is σ = 21220052320404. Its totient is φ = 21219991920000.

The previous prime is 21220022120191. The next prime is 21220022120237. The reversal of 21220022120201 is 10202122002212.

It is a happy number.

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 13276192609801 + 7943829510400 = 3643651^2 + 2818480^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220022120201 - 2³⁰ = 21218948378377 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 21220022120201.

It is not an unprimeable number, because it can be changed into a prime (21220022120251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14020400 + ... + 15460001.

It is an arithmetic number, because the mean of its divisors is an integer number (5305013080101).

Almost surely, 2^{21220022120201} is an apocalyptic number.

It is an amenable number.

21220022120201 is a deficient number, since it is larger than the sum of its proper divisors (30200203).

21220022120201 is an equidigital number, since it uses as much as digits as its factorization.

21220022120201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30200202.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21220022120201 its reverse (10202122002212), we get a palindrome (31422144122413).

The spelling of 21220022120201 in words is "twenty-one trillion, two hundred twenty billion, twenty-two million, one hundred twenty thousand, two hundred one".