21363795265 has 8 divisors (see below), whose sum is σ = 25659930600. Its totient is φ = 17075452032.

The previous prime is 21363795259. The next prime is 21363795269. The reversal of 21363795265 is 56259736312.

It can be written as a sum of positive squares in 4 ways, for example, as 2723900481 + 18639894784 = 52191^2 + 136528^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21363795265 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21363795269) 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, 1941990 + ... + 1952959.

It is an arithmetic number, because the mean of its divisors is an integer number (3207491325).

Almost surely, 2^21363795265 is an apocalyptic number.

It is an amenable number.

21363795265 is a deficient number, since it is larger than the sum of its proper divisors (4296135335).

21363795265 is a wasteful number, since it uses less digits than its factorization.

21363795265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3896051.

The product of its digits is 2041200, while the sum is 49.

The spelling of 21363795265 in words is "twenty-one billion, three hundred sixty-three million, seven hundred ninety-five thousand, two hundred sixty-five".