21030443213 has 16 divisors (see below), whose sum is σ = 23437236480. Its totient is φ = 18736837056.

The previous prime is 21030443201. The next prime is 21030443219. The reversal of 21030443213 is 31234403012.

It is a cyclic number.

It is not a de Polignac number, because 21030443213 - 2⁴ = 21030443197 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 (21030443219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1329356 + ... + 1345082.

It is an arithmetic number, because the mean of its divisors is an integer number (1464827280).

Almost surely, 2^21030443213 is an apocalyptic number.

It is an amenable number.

21030443213 is a deficient number, since it is larger than the sum of its proper divisors (2406793267).

21030443213 is a wasteful number, since it uses less digits than its factorization.

21030443213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19316.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21030443213 its reverse (31234403012), we get a palindrome (52264846225).

The spelling of 21030443213 in words is "twenty-one billion, thirty million, four hundred forty-three thousand, two hundred thirteen".