21265323 has 8 divisors (see below), whose sum is σ = 29331600. Its totient is φ = 13687968.

The previous prime is 21265303. The next prime is 21265337. The reversal of 21265323 is 32356212.

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

It is not a de Polignac number, because 21265323 - 2⁶ = 21265259 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21265293 and 21265302.

It is not an unprimeable number, because it can be changed into a prime (21265303) 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, 122128 + ... + 122301.

It is an arithmetic number, because the mean of its divisors is an integer number (3666450).

Almost surely, 2^21265323 is an apocalyptic number.

21265323 is a deficient number, since it is larger than the sum of its proper divisors (8066277).

21265323 is a wasteful number, since it uses less digits than its factorization.

21265323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244461.

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

The square root of 21265323 is about 4611.4339418450. The cubic root of 21265323 is about 277.0494726721.

The spelling of 21265323 in words is "twenty-one million, two hundred sixty-five thousand, three hundred twenty-three".