21235526545 has 8 divisors (see below), whose sum is σ = 25523936424. Its totient is φ = 16960884864.

The previous prime is 21235526539. The next prime is 21235526563. The reversal of 21235526545 is 54562553212.

It can be written as a sum of positive squares in 4 ways, for example, as 5870929 + 21229655616 = 2423^2 + 145704^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21235526545 - 2¹⁷ = 21235395473 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21235526498 and 21235526507.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 3438654 + ... + 3444823.

It is an arithmetic number, because the mean of its divisors is an integer number (3190492053).

Almost surely, 2^21235526545 is an apocalyptic number.

It is an amenable number.

21235526545 is a deficient number, since it is larger than the sum of its proper divisors (4288409879).

21235526545 is an equidigital number, since it uses as much as digits as its factorization.

21235526545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6884099.

The product of its digits is 360000, while the sum is 40.

The spelling of 21235526545 in words is "twenty-one billion, two hundred thirty-five million, five hundred twenty-six thousand, five hundred forty-five".