21255096 has 32 divisors (see below), whose sum is σ = 53251200. Its totient is φ = 7069920.

The previous prime is 21255079. The next prime is 21255103. The reversal of 21255096 is 69055212.

It is a happy number.

It is a congruent number.

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, 20101 + ... + 21131.

It is an arithmetic number, because the mean of its divisors is an integer number (1664100).

Almost surely, 2^21255096 is an apocalyptic number.

It is an amenable number.

21255096 is an abundant number, since it is smaller than the sum of its proper divisors (31996104).

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

21255096 is a wasteful number, since it uses less digits than its factorization.

21255096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1899 (or 1895 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 21255096 is about 4610.3249343186. The cubic root of 21255096 is about 277.0050523218.

The spelling of 21255096 in words is "twenty-one million, two hundred fifty-five thousand, ninety-six".