21213302213 has 4 divisors (see below), whose sum is σ = 21503895468. Its totient is φ = 20922708960.

The previous prime is 21213302197. The next prime is 21213302221. The reversal of 21213302213 is 31220331212.

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 18057446884 + 3155855329 = 134378^2 + 56177^2 .

It is a cyclic number.

It is not a de Polignac number, because 21213302213 - 2⁴ = 21213302197 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 (21213322213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145296518 + ... + 145296663.

It is an arithmetic number, because the mean of its divisors is an integer number (5375973867).

Almost surely, 2^21213302213 is an apocalyptic number.

It is an amenable number.

21213302213 is a deficient number, since it is larger than the sum of its proper divisors (290593255).

21213302213 is an equidigital number, since it uses as much as digits as its factorization.

21213302213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290593254.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21213302213 its reverse (31220331212), we get a palindrome (52433633425).

The spelling of 21213302213 in words is "twenty-one billion, two hundred thirteen million, three hundred two thousand, two hundred thirteen".