21367207271 has 4 divisors (see below), whose sum is σ = 21864119112. Its totient is φ = 20870295432.

The previous prime is 21367207261. The next prime is 21367207273. The reversal of 21367207271 is 17270276312.

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 21367207271 - 2²² = 21363012967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21367207273) 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, 248455856 + ... + 248455941.

It is an arithmetic number, because the mean of its divisors is an integer number (5466029778).

Almost surely, 2^21367207271 is an apocalyptic number.

21367207271 is a deficient number, since it is larger than the sum of its proper divisors (496911841).

21367207271 is an equidigital number, since it uses as much as digits as its factorization.

21367207271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496911840.

The product of its (nonzero) digits is 49392, while the sum is 38.

The spelling of 21367207271 in words is "twenty-one billion, three hundred sixty-seven million, two hundred seven thousand, two hundred seventy-one".