21264204539 has 2 divisors, whose sum is σ = 21264204540. Its totient is φ = 21264204538.

The previous prime is 21264204527. The next prime is 21264204551. The reversal of 21264204539 is 93540246212.

It is a balanced prime because it is at equal distance from previous prime (21264204527) and next prime (21264204551).

It is a cyclic number.

It is not a de Polignac number, because 21264204539 - 2⁴ = 21264204523 is a prime.

It is not a weakly prime, because it can be changed into another prime (21264204509) 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, 10632102269 + 10632102270.

It is an arithmetic number, because the mean of its divisors is an integer number (10632102270).

Almost surely, 2^21264204539 is an apocalyptic number.

21264204539 is a deficient number, since it is larger than the sum of its proper divisors (1).

21264204539 is an equidigital number, since it uses as much as digits as its factorization.

21264204539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 21264204539 in words is "twenty-one billion, two hundred sixty-four million, two hundred four thousand, five hundred thirty-nine".