21234433443213 has 16 divisors (see below), whose sum is σ = 30196841385600. Its totient is φ = 13226313770496.

The previous prime is 21234433443149. The next prime is 21234433443229. The reversal of 21234433443213 is 31234433443212.

It is not a de Polignac number, because 21234433443213 - 2⁶ = 21234433443149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234433443313) 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, 1519560313 + ... + 1519574286.

It is an arithmetic number, because the mean of its divisors is an integer number (1887302586600).

Almost surely, 2^{21234433443213} is an apocalyptic number.

It is an amenable number.

21234433443213 is a deficient number, since it is larger than the sum of its proper divisors (8962407942387).

21234433443213 is a wasteful number, since it uses less digits than its factorization.

21234433443213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3039134756.

The product of its digits is 497664, while the sum is 39.

Adding to 21234433443213 its reverse (31234433443212), we get a palindrome (52468866886425).

Subtracting 21234433443213 from its reverse (31234433443212), we obtain a palindrome (9999999999999).

The spelling of 21234433443213 in words is "twenty-one trillion, two hundred thirty-four billion, four hundred thirty-three million, four hundred forty-three thousand, two hundred thirteen".