21245158 has 16 divisors (see below), whose sum is σ = 34836480. Its totient is φ = 9637000.

The previous prime is 21245153. The next prime is 21245167. The reversal of 21245158 is 85154212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21245153) 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 7 ways as a sum of consecutive naturals, for example, 17883 + ... + 19033.

It is an arithmetic number, because the mean of its divisors is an integer number (2177280).

Almost surely, 2^21245158 is an apocalyptic number.

21245158 is a deficient number, since it is larger than the sum of its proper divisors (13591322).

21245158 is a wasteful number, since it uses less digits than its factorization.

21245158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2003.

The product of its digits is 3200, while the sum is 28.

The square root of 21245158 is about 4609.2470100874. The cubic root of 21245158 is about 276.9618735728.

The spelling of 21245158 in words is "twenty-one million, two hundred forty-five thousand, one hundred fifty-eight".