21532065 has 16 divisors (see below), whose sum is σ = 35640000. Its totient is φ = 11087552.

The previous prime is 21532051. The next prime is 21532067. The reversal of 21532065 is 56023512.

It is a cyclic number.

It is not a de Polignac number, because 21532065 - 2⁵ = 21532033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21532067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24315 + ... + 25184.

It is an arithmetic number, because the mean of its divisors is an integer number (2227500).

Almost surely, 2^21532065 is an apocalyptic number.

It is an amenable number.

21532065 is a deficient number, since it is larger than the sum of its proper divisors (14107935).

21532065 is a wasteful number, since it uses less digits than its factorization.

21532065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49536.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 21532065 is about 4640.2656173973. The cubic root of 21532065 is about 278.2030545557.

Adding to 21532065 its reverse (56023512), we get a palindrome (77555577).

The spelling of 21532065 in words is "twenty-one million, five hundred thirty-two thousand, sixty-five".