21532823 has 8 divisors (see below), whose sum is σ = 23226000. Its totient is φ = 19844928.

The previous prime is 21532811. The next prime is 21532837. The reversal of 21532823 is 32823512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21532823 - 2¹⁰ = 21531799 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21532792 and 21532801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21532843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12848 + ... + 14426.

It is an arithmetic number, because the mean of its divisors is an integer number (2903250).

Almost surely, 2^21532823 is an apocalyptic number.

21532823 is a deficient number, since it is larger than the sum of its proper divisors (1693177).

21532823 is a wasteful number, since it uses less digits than its factorization.

21532823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2641.

The product of its digits is 2880, while the sum is 26.

The square root of 21532823 is about 4640.3472930375. The cubic root of 21532823 is about 278.2063190737.

The spelling of 21532823 in words is "twenty-one million, five hundred thirty-two thousand, eight hundred twenty-three".