21482399 has 8 divisors (see below), whose sum is σ = 21866112. Its totient is φ = 21101080.

The previous prime is 21482387. The next prime is 21482491. The reversal of 21482399 is 99328412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21482399 - 2²⁰ = 20433823 is a prime.

It is a super-2 number, since 2×21482399² = 922986933590402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21482899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31112 + ... + 31794.

It is an arithmetic number, because the mean of its divisors is an integer number (2733264).

Almost surely, 2^21482399 is an apocalyptic number.

21482399 is a deficient number, since it is larger than the sum of its proper divisors (383713).

21482399 is an equidigital number, since it uses as much as digits as its factorization.

21482399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1197.

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

The square root of 21482399 is about 4634.9108945049. The cubic root of 21482399 is about 277.9889882290.

The spelling of 21482399 in words is "twenty-one million, four hundred eighty-two thousand, three hundred ninety-nine".