21532965 has 16 divisors (see below), whose sum is σ = 36479808. Its totient is φ = 10808576.

The previous prime is 21532961. The next prime is 21532967. The reversal of 21532965 is 56923512.

21532965 = 268² + 269² + ... + 437².

It is a cyclic number.

It is not a de Polignac number, because 21532965 - 2² = 21532961 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21532961) 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, 41967 + ... + 42476.

It is an arithmetic number, because the mean of its divisors is an integer number (2279988).

Almost surely, 2^21532965 is an apocalyptic number.

It is an amenable number.

21532965 is a deficient number, since it is larger than the sum of its proper divisors (14946843).

21532965 is a wasteful number, since it uses less digits than its factorization.

21532965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84468.

The product of its digits is 16200, while the sum is 33.

The square root of 21532965 is about 4640.3625935912. The cubic root of 21532965 is about 278.2069306239.

The spelling of 21532965 in words is "twenty-one million, five hundred thirty-two thousand, nine hundred sixty-five".