21048550 has 24 divisors (see below), whose sum is σ = 41454936. Its totient is φ = 7923840.

The previous prime is 21048541. The next prime is 21048553. The reversal of 21048550 is 5584012.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21048553) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 11532 + ... + 13231.

It is an arithmetic number, because the mean of its divisors is an integer number (1727289).

Almost surely, 2^21048550 is an apocalyptic number.

21048550 is a deficient number, since it is larger than the sum of its proper divisors (20406386).

21048550 is a wasteful number, since it uses less digits than its factorization.

21048550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24792 (or 24787 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 21048550 is about 4587.8698760972. The cubic root of 21048550 is about 276.1048663331.

The spelling of 21048550 in words is "twenty-one million, forty-eight thousand, five hundred fifty".