21545001359 has 4 divisors (see below), whose sum is σ = 24622858704. Its totient is φ = 18467144016.

The previous prime is 21545001319. The next prime is 21545001419. The reversal of 21545001359 is 95310054512.

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 21545001359 - 2¹⁶ = 21544935823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21545001319) 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, 1538928662 + ... + 1538928675.

It is an arithmetic number, because the mean of its divisors is an integer number (6155714676).

Almost surely, 2^21545001359 is an apocalyptic number.

21545001359 is a deficient number, since it is larger than the sum of its proper divisors (3077857345).

21545001359 is an equidigital number, since it uses as much as digits as its factorization.

21545001359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3077857344.

The product of its (nonzero) digits is 27000, while the sum is 35.

The spelling of 21545001359 in words is "twenty-one billion, five hundred forty-five million, one thousand, three hundred fifty-nine".