21213023443 has 8 divisors (see below), whose sum is σ = 22084285680. Its totient is φ = 20351079840.

The previous prime is 21213023417. The next prime is 21213023473. The reversal of 21213023443 is 34432031212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21213023443 - 2⁹ = 21213022931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21213023473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2325013 + ... + 2334118.

It is an arithmetic number, because the mean of its divisors is an integer number (2760535710).

Almost surely, 2^21213023443 is an apocalyptic number.

21213023443 is a deficient number, since it is larger than the sum of its proper divisors (871262237).

21213023443 is a wasteful number, since it uses less digits than its factorization.

21213023443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4659317.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21213023443 its reverse (34432031212), we get a palindrome (55645054655).

The spelling of 21213023443 in words is "twenty-one billion, two hundred thirteen million, twenty-three thousand, four hundred forty-three".