21275037 has 24 divisors (see below), whose sum is σ = 36073856. Its totient is φ = 11827296.

The previous prime is 21275027. The next prime is 21275039. The reversal of 21275037 is 73057212.

It is not a de Polignac number, because 21275037 - 2¹² = 21270941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21275037.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21275039) 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 23 ways as a sum of consecutive naturals, for example, 2233 + ... + 6894.

Almost surely, 2^21275037 is an apocalyptic number.

It is an amenable number.

21275037 is a deficient number, since it is larger than the sum of its proper divisors (14798819).

21275037 is a wasteful number, since it uses less digits than its factorization.

21275037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9177 (or 9174 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 21275037 is about 4612.4870731526. The cubic root of 21275037 is about 277.0916516520.

The spelling of 21275037 in words is "twenty-one million, two hundred seventy-five thousand, thirty-seven".