21213211313213 has 4 divisors (see below), whose sum is σ = 21308337821568. Its totient is φ = 21118084804860.

The previous prime is 21213211313201. The next prime is 21213211313279. The reversal of 21213211313213 is 31231311231212.

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 21213211313213 - 2⁴ = 21213211313197 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 (21213211313813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47563253843 + ... + 47563254288.

It is an arithmetic number, because the mean of its divisors is an integer number (5327084455392).

Almost surely, 2^{21213211313213} is an apocalyptic number.

It is an amenable number.

21213211313213 is a deficient number, since it is larger than the sum of its proper divisors (95126508355).

21213211313213 is an equidigital number, since it uses as much as digits as its factorization.

21213211313213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95126508354.

The product of its digits is 1296, while the sum is 26.

Adding to 21213211313213 its reverse (31231311231212), we get a palindrome (52444522544425).

The spelling of 21213211313213 in words is "twenty-one trillion, two hundred thirteen billion, two hundred eleven million, three hundred thirteen thousand, two hundred thirteen".