21333564205 has 8 divisors (see below), whose sum is σ = 26483045400. Its totient is φ = 16478339136.

The previous prime is 21333564151. The next prime is 21333564209. The reversal of 21333564205 is 50246533312.

It can be written as a sum of positive squares in 4 ways, for example, as 6435408841 + 14898155364 = 80221^2 + 122058^2 .

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 21333564205 - 2¹⁵ = 21333531437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333564209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73563870 + ... + 73564159.

It is an arithmetic number, because the mean of its divisors is an integer number (3310380675).

Almost surely, 2^21333564205 is an apocalyptic number.

It is an amenable number.

21333564205 is a deficient number, since it is larger than the sum of its proper divisors (5149481195).

21333564205 is a wasteful number, since it uses less digits than its factorization.

21333564205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147128063.

The product of its (nonzero) digits is 64800, while the sum is 34.

The spelling of 21333564205 in words is "twenty-one billion, three hundred thirty-three million, five hundred sixty-four thousand, two hundred five".