21252489367 has 2 divisors, whose sum is σ = 21252489368. Its totient is φ = 21252489366.

The previous prime is 21252489337. The next prime is 21252489397. The reversal of 21252489367 is 76398425212.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (21252489337) and next prime (21252489397).

It is a cyclic number.

It is not a de Polignac number, because 21252489367 - 2³¹ = 19105005719 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21252489367.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21252489337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10626244683 + 10626244684.

It is an arithmetic number, because the mean of its divisors is an integer number (10626244684).

Almost surely, 2^21252489367 is an apocalyptic number.

21252489367 is a deficient number, since it is larger than the sum of its proper divisors (1).

21252489367 is an equidigital number, since it uses as much as digits as its factorization.

21252489367 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 49.

The spelling of 21252489367 in words is "twenty-one billion, two hundred fifty-two million, four hundred eighty-nine thousand, three hundred sixty-seven".