21232511065 has 16 divisors (see below), whose sum is σ = 26600358528. Its totient is φ = 16239198976.

The previous prime is 21232511051. The next prime is 21232511089. The reversal of 21232511065 is 56011523212.

It is a cyclic number.

It is not a de Polignac number, because 21232511065 - 2⁵ = 21232511033 is a prime.

It is a super-2 number, since 2×21232511065² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

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, 184257 + ... + 276433.

It is an arithmetic number, because the mean of its divisors is an integer number (1662522408).

Almost surely, 2^21232511065 is an apocalyptic number.

It is an amenable number.

21232511065 is a deficient number, since it is larger than the sum of its proper divisors (5367847463).

21232511065 is a wasteful number, since it uses less digits than its factorization.

21232511065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94208.

The product of its (nonzero) digits is 3600, while the sum is 28.

The spelling of 21232511065 in words is "twenty-one billion, two hundred thirty-two million, five hundred eleven thousand, sixty-five".