21127018 has 32 divisors (see below), whose sum is σ = 36951552. Its totient is φ = 8962800.

The previous prime is 21127009. The next prime is 21127021. The reversal of 21127018 is 81072112.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a self number, because there is not a number n which added to its sum of digits gives 21127018.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21273 + ... + 22243.

It is an arithmetic number, because the mean of its divisors is an integer number (1154736).

Almost surely, 2^21127018 is an apocalyptic number.

21127018 is a deficient number, since it is larger than the sum of its proper divisors (15824534).

21127018 is a wasteful number, since it uses less digits than its factorization.

21127018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050.

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 21127018 is about 4596.4136019292. The cubic root of 21127018 is about 276.4475428238.

The spelling of 21127018 in words is "twenty-one million, one hundred twenty-seven thousand, eighteen".