21242127267 has 12 divisors (see below), whose sum is σ = 30712336200. Its totient is φ = 14147911968.

The previous prime is 21242127253. The next prime is 21242127271. The reversal of 21242127267 is 76272124212.

It is not a de Polignac number, because 21242127267 - 2¹⁸ = 21241865123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21242127367) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1115553 + ... + 1134434.

It is an arithmetic number, because the mean of its divisors is an integer number (2559361350).

Almost surely, 2^21242127267 is an apocalyptic number.

21242127267 is a deficient number, since it is larger than the sum of its proper divisors (9470208933).

21242127267 is a wasteful number, since it uses less digits than its factorization.

21242127267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2251042 (or 2251039 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The spelling of 21242127267 in words is "twenty-one billion, two hundred forty-two million, one hundred twenty-seven thousand, two hundred sixty-seven".