21332220012221 has 4 divisors (see below), whose sum is σ = 21427880191872. Its totient is φ = 21236559832572.

The previous prime is 21332220012199. The next prime is 21332220012241. The reversal of 21332220012221 is 12221002223312.

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 21332220012221 - 2¹⁸ = 21332219750077 is a prime.

It is a super-2 number, since 2×21332220012221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21332220012241) 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, 47830089491 + ... + 47830089936.

It is an arithmetic number, because the mean of its divisors is an integer number (5356970047968).

Almost surely, 2^{21332220012221} is an apocalyptic number.

It is an amenable number.

21332220012221 is a deficient number, since it is larger than the sum of its proper divisors (95660179651).

21332220012221 is an equidigital number, since it uses as much as digits as its factorization.

21332220012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95660179650.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21332220012221 its reverse (12221002223312), we get a palindrome (33553222235533).

The spelling of 21332220012221 in words is "twenty-one trillion, three hundred thirty-two billion, two hundred twenty million, twelve thousand, two hundred twenty-one".