21238485 has 16 divisors (see below), whose sum is σ = 35770560. Its totient is φ = 10730880.

The previous prime is 21238471. The next prime is 21238487. The reversal of 21238485 is 58483212.

It is not a de Polignac number, because 21238485 - 2⁸ = 21238229 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21238487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36976 + ... + 37545.

It is an arithmetic number, because the mean of its divisors is an integer number (2235660).

Almost surely, 2^21238485 is an apocalyptic number.

It is an amenable number.

21238485 is a deficient number, since it is larger than the sum of its proper divisors (14532075).

21238485 is a wasteful number, since it uses less digits than its factorization.

21238485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74548.

The product of its digits is 15360, while the sum is 33.

The square root of 21238485 is about 4608.5230822900. The cubic root of 21238485 is about 276.9328730806.

The spelling of 21238485 in words is "twenty-one million, two hundred thirty-eight thousand, four hundred eighty-five".