21230232213 has 32 divisors (see below), whose sum is σ = 30345525504. Its totient is φ = 13155996672.

The previous prime is 21230232211. The next prime is 21230232223. The reversal of 21230232213 is 31223203212.

It is a happy number.

It is not a de Polignac number, because 21230232213 - 2¹ = 21230232211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21230232213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230232211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1329231 + ... + 1345107.

It is an arithmetic number, because the mean of its divisors is an integer number (948297672).

Almost surely, 2^21230232213 is an apocalyptic number.

It is an amenable number.

21230232213 is a deficient number, since it is larger than the sum of its proper divisors (9115293291).

21230232213 is a wasteful number, since it uses less digits than its factorization.

21230232213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16221.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21230232213 its reverse (31223203212), we get a palindrome (52453435425).

The spelling of 21230232213 in words is "twenty-one billion, two hundred thirty million, two hundred thirty-two thousand, two hundred thirteen".