21220320112213 has 4 divisors (see below), whose sum is σ = 21330269957548. Its totient is φ = 21110370266880.

The previous prime is 21220320112177. The next prime is 21220320112217. The reversal of 21220320112213 is 31221102302212.

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 2311546222129 + 18908773890084 = 1520377^2 + 4348422^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220320112213 - 2⁹ = 21220320111701 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 (21220320112217) 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, 54974922378 + ... + 54974922763.

It is an arithmetic number, because the mean of its divisors is an integer number (5332567489387).

Almost surely, 2^{21220320112213} is an apocalyptic number.

It is an amenable number.

21220320112213 is a deficient number, since it is larger than the sum of its proper divisors (109949845335).

21220320112213 is a wasteful number, since it uses less digits than its factorization.

21220320112213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109949845334.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21220320112213 its reverse (31221102302212), we get a palindrome (52441422414425).

The spelling of 21220320112213 in words is "twenty-one trillion, two hundred twenty billion, three hundred twenty million, one hundred twelve thousand, two hundred thirteen".