21267243337 has 4 divisors (see below), whose sum is σ = 21288879360. Its totient is φ = 21245607316.

The previous prime is 21267243323. The next prime is 21267243353. The reversal of 21267243337 is 73334276212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21267243337 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21267243337.

It is not an unprimeable number, because it can be changed into a prime (21267243377) 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, 10816537 + ... + 10818502.

It is an arithmetic number, because the mean of its divisors is an integer number (5322219840).

Almost surely, 2^21267243337 is an apocalyptic number.

It is an amenable number.

21267243337 is a deficient number, since it is larger than the sum of its proper divisors (21636023).

21267243337 is an equidigital number, since it uses as much as digits as its factorization.

21267243337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21636022.

The product of its digits is 254016, while the sum is 40.

The spelling of 21267243337 in words is "twenty-one billion, two hundred sixty-seven million, two hundred forty-three thousand, three hundred thirty-seven".