21262410265 has 16 divisors (see below), whose sum is σ = 26003799360. Its totient is φ = 16685245120.

The previous prime is 21262410179. The next prime is 21262410271. The reversal of 21262410265 is 56201426212.

It is not a de Polignac number, because 21262410265 - 2⁷ = 21262410137 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57822 + ... + 214168.

It is an arithmetic number, because the mean of its divisors is an integer number (1625237460).

Almost surely, 2^21262410265 is an apocalyptic number.

It is an amenable number.

21262410265 is a deficient number, since it is larger than the sum of its proper divisors (4741389095).

21262410265 is a wasteful number, since it uses less digits than its factorization.

21262410265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156872.

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 21262410265 its reverse (56201426212), we get a palindrome (77463836477).

The spelling of 21262410265 in words is "twenty-one billion, two hundred sixty-two million, four hundred ten thousand, two hundred sixty-five".