21331222213 has 8 divisors (see below), whose sum is σ = 24403654080. Its totient is φ = 18265068960.

The previous prime is 21331222193. The next prime is 21331222247. The reversal of 21331222213 is 31222213312.

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 21331222213 - 2²¹ = 21329125061 is a prime.

It is a super-2 number, since 2×21331222213² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331222313) 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, 1562368 + ... + 1575961.

It is an arithmetic number, because the mean of its divisors is an integer number (3050456760).

Almost surely, 2^21331222213 is an apocalyptic number.

It is an amenable number.

21331222213 is a deficient number, since it is larger than the sum of its proper divisors (3072431867).

21331222213 is an equidigital number, since it uses as much as digits as its factorization.

21331222213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3139307.

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

Adding to 21331222213 its reverse (31222213312), we get a palindrome (52553435525).

The spelling of 21331222213 in words is "twenty-one billion, three hundred thirty-one million, two hundred twenty-two thousand, two hundred thirteen".