21222002021201 has 4 divisors (see below), whose sum is σ = 21225875361600. Its totient is φ = 21218128680804.

The previous prime is 21222002021179. The next prime is 21222002021239. The reversal of 21222002021201 is 10212020022212.

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 21222002021201 - 2¹⁴ = 21222002004817 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 21222002021201.

It is not an unprimeable number, because it can be changed into a prime (21222002021251) 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, 1936661981 + ... + 1936672938.

It is an arithmetic number, because the mean of its divisors is an integer number (5306468840400).

Almost surely, 2^{21222002021201} is an apocalyptic number.

It is an amenable number.

21222002021201 is a deficient number, since it is larger than the sum of its proper divisors (3873340399).

21222002021201 is an equidigital number, since it uses as much as digits as its factorization.

21222002021201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3873340398.

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

Adding to 21222002021201 its reverse (10212020022212), we get a palindrome (31434022043413).

The spelling of 21222002021201 in words is "twenty-one trillion, two hundred twenty-two billion, two million, twenty-one thousand, two hundred one".