21038370 has 16 divisors (see below), whose sum is σ = 50492160. Its totient is φ = 5610224.

The previous prime is 21038363. The next prime is 21038389. The reversal of 21038370 is 7383012.

It is a super-2 number, since 2×21038370² = 885226024513800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21038370.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350610 + ... + 350669.

It is an arithmetic number, because the mean of its divisors is an integer number (3155760).

Almost surely, 2^21038370 is an apocalyptic number.

21038370 is an abundant number, since it is smaller than the sum of its proper divisors (29453790).

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

21038370 is a wasteful number, since it uses less digits than its factorization.

21038370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701289.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21038370 is about 4586.7602945870. The cubic root of 21038370 is about 276.0603470227.

The spelling of 21038370 in words is "twenty-one million, thirty-eight thousand, three hundred seventy".