21265192 has 32 divisors (see below), whose sum is σ = 43543080. Its totient is φ = 9676800.

The previous prime is 21265171. The next prime is 21265217. The reversal of 21265192 is 29156212.

It can be written as a sum of positive squares in 4 ways, for example, as 15476356 + 5788836 = 3934^2 + 2406^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21265192.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6192 + ... + 8992.

Almost surely, 2^21265192 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21265192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21771540).

21265192 is an abundant number, since it is smaller than the sum of its proper divisors (22277888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21265192 is a wasteful number, since it uses less digits than its factorization.

21265192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2893 (or 2889 counting only the distinct ones).

The product of its digits is 2160, while the sum is 28.

The square root of 21265192 is about 4611.4197379983. The cubic root of 21265192 is about 277.0489037716.

The spelling of 21265192 in words is "twenty-one million, two hundred sixty-five thousand, one hundred ninety-two".