21232365 has 64 divisors (see below), whose sum is σ = 43794432. Its totient is φ = 8524800.

The previous prime is 21232363. The next prime is 21232369. The reversal of 21232365 is 56323212.

It is not a de Polignac number, because 21232365 - 2¹ = 21232363 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232363) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 35509 + ... + 36101.

It is an arithmetic number, because the mean of its divisors is an integer number (684288).

Almost surely, 2^21232365 is an apocalyptic number.

It is an amenable number.

21232365 is an abundant number, since it is smaller than the sum of its proper divisors (22562067).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21232365 is a wasteful number, since it uses less digits than its factorization.

21232365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650.

The product of its digits is 2160, while the sum is 24.

The square root of 21232365 is about 4607.8590473234. The cubic root of 21232365 is about 276.9062705553.

Adding to 21232365 its reverse (56323212), we get a palindrome (77555577).

The spelling of 21232365 in words is "twenty-one million, two hundred thirty-two thousand, three hundred sixty-five".