21263325 has 12 divisors (see below), whose sum is σ = 35155488. Its totient is φ = 11340400.

The previous prime is 21263309. The next prime is 21263353. The reversal of 21263325 is 52336212.

It is not a de Polignac number, because 21263325 - 2⁴ = 21263309 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21263295 and 21263304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141681 + ... + 141830.

It is an arithmetic number, because the mean of its divisors is an integer number (2929624).

Almost surely, 2^21263325 is an apocalyptic number.

21263325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21263325 is a deficient number, since it is larger than the sum of its proper divisors (13892163).

21263325 is a wasteful number, since it uses less digits than its factorization.

21263325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283524 (or 283519 counting only the distinct ones).

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

The square root of 21263325 is about 4611.2173013208. The cubic root of 21263325 is about 277.0407956006.

Adding to 21263325 its reverse (52336212), we get a palindrome (73599537).

The spelling of 21263325 in words is "twenty-one million, two hundred sixty-three thousand, three hundred twenty-five".