21320222213 has 4 divisors (see below), whose sum is σ = 21320554080. Its totient is φ = 21319890348.

The previous prime is 21320222197. The next prime is 21320222219. The reversal of 21320222213 is 31222202312.

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 21320222213 - 2⁴ = 21320222197 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 (21320222219) 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, 35273 + ... + 209486.

It is an arithmetic number, because the mean of its divisors is an integer number (5330138520).

Almost surely, 2^21320222213 is an apocalyptic number.

It is an amenable number.

21320222213 is a deficient number, since it is larger than the sum of its proper divisors (331867).

21320222213 is an equidigital number, since it uses as much as digits as its factorization.

21320222213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331866.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21320222213 its reverse (31222202312), we get a palindrome (52542424525).

The spelling of 21320222213 in words is "twenty-one billion, three hundred twenty million, two hundred twenty-two thousand, two hundred thirteen".