21222000122201 has 4 divisors (see below), whose sum is σ = 22144695779712. Its totient is φ = 20299304464692.

The previous prime is 21222000122179. The next prime is 21222000122203. The reversal of 21222000122201 is 10222100022212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21222000122201 - 2⁴² = 16823953611097 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 21222000122201.

It is not an unprimeable number, because it can be changed into a prime (21222000122203) 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, 461347828721 + ... + 461347828766.

It is an arithmetic number, because the mean of its divisors is an integer number (5536173944928).

Almost surely, 2^{21222000122201} is an apocalyptic number.

It is an amenable number.

21222000122201 is a deficient number, since it is larger than the sum of its proper divisors (922695657511).

21222000122201 is an equidigital number, since it uses as much as digits as its factorization.

21222000122201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922695657510.

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

Adding to 21222000122201 its reverse (10222100022212), we get a palindrome (31444100144413).

The spelling of 21222000122201 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-two thousand, two hundred one".