21270244267 has 4 divisors (see below), whose sum is σ = 22195037520. Its totient is φ = 20345451016.

The previous prime is 21270244243. The next prime is 21270244273. The reversal of 21270244267 is 76244207212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21270244267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21270244207) 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, 462396592 + ... + 462396637.

It is an arithmetic number, because the mean of its divisors is an integer number (5548759380).

Almost surely, 2^21270244267 is an apocalyptic number.

21270244267 is a deficient number, since it is larger than the sum of its proper divisors (924793253).

21270244267 is an equidigital number, since it uses as much as digits as its factorization.

21270244267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924793252.

The product of its (nonzero) digits is 75264, while the sum is 37.

The spelling of 21270244267 in words is "twenty-one billion, two hundred seventy million, two hundred forty-four thousand, two hundred sixty-seven".