21739238067 has 4 divisors (see below), whose sum is σ = 28985650760. Its totient is φ = 14492825376.

The previous prime is 21739238063. The next prime is 21739238089. The reversal of 21739238067 is 76083293712.

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

It is not a de Polignac number, because 21739238067 - 2² = 21739238063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21739238063) 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, 3623206342 + ... + 3623206347.

It is an arithmetic number, because the mean of its divisors is an integer number (7246412690).

Almost surely, 2^21739238067 is an apocalyptic number.

21739238067 is a deficient number, since it is larger than the sum of its proper divisors (7246412693).

21739238067 is an equidigital number, since it uses as much as digits as its factorization.

21739238067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7246412692.

The product of its (nonzero) digits is 762048, while the sum is 48.

The spelling of 21739238067 in words is "twenty-one billion, seven hundred thirty-nine million, two hundred thirty-eight thousand, sixty-seven".