21000230213 has 4 divisors (see below), whose sum is σ = 21004163040. Its totient is φ = 20996297388.

The previous prime is 21000230197. The next prime is 21000230239. The reversal of 21000230213 is 31203200012.

It is a happy number.

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 21000230213 - 2⁴ = 21000230197 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 (21000230113) 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, 1958393 + ... + 1969086.

It is an arithmetic number, because the mean of its divisors is an integer number (5251040760).

Almost surely, 2^21000230213 is an apocalyptic number.

It is an amenable number.

21000230213 is a deficient number, since it is larger than the sum of its proper divisors (3932827).

21000230213 is an equidigital number, since it uses as much as digits as its factorization.

21000230213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3932826.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21000230213 its reverse (31203200012), we get a palindrome (52203430225).

The spelling of 21000230213 in words is "twenty-one billion, two hundred thirty thousand, two hundred thirteen".