21013432443 has 6 divisors (see below), whose sum is σ = 30352735764. Its totient is φ = 14008954956.

The previous prime is 21013432441. The next prime is 21013432469. The reversal of 21013432443 is 34423431012.

21013432443 is a `hidden beast` number, since 210 + 1 + 3 + 4 + 3 + 2 + 443 = 666.

It is not a de Polignac number, because 21013432443 - 2¹ = 21013432441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21013432441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1167412905 + ... + 1167412922.

It is an arithmetic number, because the mean of its divisors is an integer number (5058789294).

Almost surely, 2^21013432443 is an apocalyptic number.

21013432443 is a deficient number, since it is larger than the sum of its proper divisors (9339303321).

21013432443 is a wasteful number, since it uses less digits than its factorization.

21013432443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334825833 (or 2334825830 counting only the distinct ones).

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

Adding to 21013432443 its reverse (34423431012), we get a palindrome (55436863455).

The spelling of 21013432443 in words is "twenty-one billion, thirteen million, four hundred thirty-two thousand, four hundred forty-three".