21245537267 has 2 divisors, whose sum is σ = 21245537268. Its totient is φ = 21245537266.

The previous prime is 21245537237. The next prime is 21245537479. The reversal of 21245537267 is 76273554212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21245537267 - 2¹⁸ = 21245275123 is a prime.

It is not a weakly prime, because it can be changed into another prime (21245537227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10622768633 + 10622768634.

It is an arithmetic number, because the mean of its divisors is an integer number (10622768634).

Almost surely, 2^21245537267 is an apocalyptic number.

21245537267 is a deficient number, since it is larger than the sum of its proper divisors (1).

21245537267 is an equidigital number, since it uses as much as digits as its factorization.

21245537267 is an evil number, because the sum of its binary digits is even.

The product of its digits is 705600, while the sum is 44.

The spelling of 21245537267 in words is "twenty-one billion, two hundred forty-five million, five hundred thirty-seven thousand, two hundred sixty-seven".