21429163671 has 4 divisors (see below), whose sum is σ = 28572218232. Its totient is φ = 14286109112.

The previous prime is 21429163669. The next prime is 21429163703. The reversal of 21429163671 is 17636192412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21429163671 - 2¹ = 21429163669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21429163631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3571527276 + ... + 3571527281.

It is an arithmetic number, because the mean of its divisors is an integer number (7143054558).

Almost surely, 2^21429163671 is an apocalyptic number.

21429163671 is a deficient number, since it is larger than the sum of its proper divisors (7143054561).

21429163671 is an equidigital number, since it uses as much as digits as its factorization.

21429163671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7143054560.

The product of its digits is 108864, while the sum is 42.

The spelling of 21429163671 in words is "twenty-one billion, four hundred twenty-nine million, one hundred sixty-three thousand, six hundred seventy-one".