21482939 has 16 divisors (see below), whose sum is σ = 23654400. Its totient is φ = 19432224.

The previous prime is 21482927. The next prime is 21482941. The reversal of 21482939 is 93928412.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21482939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21482959) 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, 69824 + ... + 70130.

It is an arithmetic number, because the mean of its divisors is an integer number (1478400).

Almost surely, 2^21482939 is an apocalyptic number.

21482939 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21482939 is a deficient number, since it is larger than the sum of its proper divisors (2171461).

21482939 is a wasteful number, since it uses less digits than its factorization.

21482939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482.

The product of its digits is 31104, while the sum is 38.

The square root of 21482939 is about 4634.9691476859. The cubic root of 21482939 is about 277.9913174660.

The spelling of 21482939 in words is "twenty-one million, four hundred eighty-two thousand, nine hundred thirty-nine".