21701125267 has 4 divisors (see below), whose sum is σ = 21719786040. Its totient is φ = 21682464496.

The previous prime is 21701125247. The next prime is 21701125279. The reversal of 21701125267 is 76252110712.

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 21701125267 - 2¹¹ = 21701123219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21701125247) 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, 9328642 + ... + 9330967.

It is an arithmetic number, because the mean of its divisors is an integer number (5429946510).

Almost surely, 2^21701125267 is an apocalyptic number.

21701125267 is a deficient number, since it is larger than the sum of its proper divisors (18660773).

21701125267 is a wasteful number, since it uses less digits than its factorization.

21701125267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18660772.

The product of its (nonzero) digits is 11760, while the sum is 34.

Adding to 21701125267 its reverse (76252110712), we get a palindrome (97953235979).

The spelling of 21701125267 in words is "twenty-one billion, seven hundred one million, one hundred twenty-five thousand, two hundred sixty-seven".