21223312213 has 8 divisors (see below), whose sum is σ = 21373241400. Its totient is φ = 21073483200.

The previous prime is 21223312199. The next prime is 21223312247. The reversal of 21223312213 is 31221332212.

It can be written as a sum of positive squares in 4 ways, for example, as 7544138449 + 13679173764 = 86857^2 + 116958^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21223312213 - 2⁵ = 21223312181 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 (21223319213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 429063 + ... + 475963.

It is an arithmetic number, because the mean of its divisors is an integer number (2671655175).

Almost surely, 2^21223312213 is an apocalyptic number.

It is an amenable number.

21223312213 is a deficient number, since it is larger than the sum of its proper divisors (149929187).

21223312213 is a wasteful number, since it uses less digits than its factorization.

21223312213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50087.

The product of its digits is 864, while the sum is 22.

Adding to 21223312213 its reverse (31221332212), we get a palindrome (52444644425).

The spelling of 21223312213 in words is "twenty-one billion, two hundred twenty-three million, three hundred twelve thousand, two hundred thirteen".