21220023112221 has 4 divisors (see below), whose sum is σ = 28293364149632. Its totient is φ = 14146682074812.

The previous prime is 21220023112217. The next prime is 21220023112261. The reversal of 21220023112221 is 12221132002212.

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 not a de Polignac number, because 21220023112221 - 2² = 21220023112217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220023112201) 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, 3536670518701 + ... + 3536670518706.

It is an arithmetic number, because the mean of its divisors is an integer number (7073341037408).

Almost surely, 2^{21220023112221} is an apocalyptic number.

It is an amenable number.

21220023112221 is a deficient number, since it is larger than the sum of its proper divisors (7073341037411).

21220023112221 is an equidigital number, since it uses as much as digits as its factorization.

21220023112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7073341037410.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21220023112221 its reverse (12221132002212), we get a palindrome (33441155114433).

The spelling of 21220023112221 in words is "twenty-one trillion, two hundred twenty billion, twenty-three million, one hundred twelve thousand, two hundred twenty-one".