21132548 has 12 divisors (see below), whose sum is σ = 37884252. Its totient is φ = 10308480.

The previous prime is 21132509. The next prime is 21132557. The reversal of 21132548 is 84523112.

It can be written as a sum of positive squares in 2 ways, for example, as 7941124 + 13191424 = 2818^2 + 3632^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64265 + ... + 64592.

It is an arithmetic number, because the mean of its divisors is an integer number (3157021).

Almost surely, 2^21132548 is an apocalyptic number.

It is an amenable number.

21132548 is a deficient number, since it is larger than the sum of its proper divisors (16751704).

21132548 is a wasteful number, since it uses less digits than its factorization.

21132548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128902 (or 128900 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

The square root of 21132548 is about 4597.0151185307. The cubic root of 21132548 is about 276.4716607810.

The spelling of 21132548 in words is "twenty-one million, one hundred thirty-two thousand, five hundred forty-eight".