21255048 has 40 divisors (see below), whose sum is σ = 59535630. Its totient is φ = 7084800.

The previous prime is 21255019. The next prime is 21255061. The reversal of 21255048 is 84055212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20412324 + 842724 = 4518^2 + 918^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 15753 + ... + 17048.

Almost surely, 2^21255048 is an apocalyptic number.

It is an amenable number.

21255048 is an abundant number, since it is smaller than the sum of its proper divisors (38280582).

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

21255048 is a wasteful number, since it uses less digits than its factorization.

21255048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32819 (or 32806 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 21255048 is about 4610.3197286089. The cubic root of 21255048 is about 277.0048438031.

The spelling of 21255048 in words is "twenty-one million, two hundred fifty-five thousand, forty-eight".