21220342213 has 4 divisors (see below), whose sum is σ = 24251819680. Its totient is φ = 18188864748.

The previous prime is 21220342211. The next prime is 21220342217. The reversal of 21220342213 is 31224302212.

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 21220342213 - 2¹ = 21220342211 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 (21220342211) 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, 1515738723 + ... + 1515738736.

It is an arithmetic number, because the mean of its divisors is an integer number (6062954920).

Almost surely, 2^21220342213 is an apocalyptic number.

It is an amenable number.

21220342213 is a deficient number, since it is larger than the sum of its proper divisors (3031477467).

21220342213 is an equidigital number, since it uses as much as digits as its factorization.

21220342213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3031477466.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21220342213 its reverse (31224302212), we get a palindrome (52444644425).

The spelling of 21220342213 in words is "twenty-one billion, two hundred twenty million, three hundred forty-two thousand, two hundred thirteen".