21403231443 has 12 divisors (see below), whose sum is σ = 33726304248. Its totient is φ = 12971655360.

The previous prime is 21403231433. The next prime is 21403231459. The reversal of 21403231443 is 34413230412.

21403231443 is a `hidden beast` number, since 21 + 403 + 231 + 4 + 4 + 3 = 666.

It is not a de Polignac number, because 21403231443 - 2¹⁴ = 21403215059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21403231433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108097030 + ... + 108097227.

It is an arithmetic number, because the mean of its divisors is an integer number (2810525354).

Almost surely, 2^21403231443 is an apocalyptic number.

21403231443 is a deficient number, since it is larger than the sum of its proper divisors (12323072805).

21403231443 is a wasteful number, since it uses less digits than its factorization.

21403231443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216194274 (or 216194271 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21403231443 its reverse (34413230412), we get a palindrome (55816461855).

The spelling of 21403231443 in words is "twenty-one billion, four hundred three million, two hundred thirty-one thousand, four hundred forty-three".