21037075 has 12 divisors (see below), whose sum is σ = 27621000. Its totient is φ = 15839360.

The previous prime is 21037061. The next prime is 21037103. The reversal of 21037075 is 57073012.

It is not a de Polignac number, because 21037075 - 2⁷ = 21036947 is a prime.

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24325 + ... + 25174.

It is an arithmetic number, because the mean of its divisors is an integer number (2301750).

Almost surely, 2^21037075 is an apocalyptic number.

21037075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21037075 is a deficient number, since it is larger than the sum of its proper divisors (6583925).

21037075 is a wasteful number, since it uses less digits than its factorization.

21037075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49526 (or 49521 counting only the distinct ones).

The product of its (nonzero) digits is 1470, while the sum is 25.

The square root of 21037075 is about 4586.6191252381. The cubic root of 21037075 is about 276.0546826820.

The spelling of 21037075 in words is "twenty-one million, thirty-seven thousand, seventy-five".