21033431343 has 24 divisors (see below), whose sum is σ = 30588632256. Its totient is φ = 13926945600.

The previous prime is 21033431333. The next prime is 21033431387. The reversal of 21033431343 is 34313433012.

21033431343 is a `hidden beast` number, since 2 + 10 + 334 + 313 + 4 + 3 = 666.

It is not a de Polignac number, because 21033431343 - 2⁴ = 21033431327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033431323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1329546 + ... + 1345272.

It is an arithmetic number, because the mean of its divisors is an integer number (1274526344).

Almost surely, 2^21033431343 is an apocalyptic number.

21033431343 is a deficient number, since it is larger than the sum of its proper divisors (9555200913).

21033431343 is a wasteful number, since it uses less digits than its factorization.

21033431343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16735 (or 16732 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 27.

Adding to 21033431343 its reverse (34313433012), we get a palindrome (55346864355).

The spelling of 21033431343 in words is "twenty-one billion, thirty-three million, four hundred thirty-one thousand, three hundred forty-three".