21213000313 has 4 divisors (see below), whose sum is σ = 21213333648. Its totient is φ = 21212666980.

The previous prime is 21213000293. The next prime is 21213000343. The reversal of 21213000313 is 31300031212.

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 a de Polignac number, because none of the positive numbers 2^k-21213000313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213000343) 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, 38203 + ... + 209488.

It is an arithmetic number, because the mean of its divisors is an integer number (5303333412).

Almost surely, 2^21213000313 is an apocalyptic number.

It is an amenable number.

21213000313 is a deficient number, since it is larger than the sum of its proper divisors (333335).

21213000313 is an equidigital number, since it uses as much as digits as its factorization.

21213000313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333334.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21213000313 its reverse (31300031212), we get a palindrome (52513031525).

The spelling of 21213000313 in words is "twenty-one billion, two hundred thirteen million, three hundred thirteen", and thus it is an aban number.