21482215 has 4 divisors (see below), whose sum is σ = 25778664. Its totient is φ = 17185768.

The previous prime is 21482191. The next prime is 21482239. The reversal of 21482215 is 51228412.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21482191) and next prime (21482239).

It is a cyclic number.

It is not a de Polignac number, because 21482215 - 2¹¹ = 21480167 is a prime.

It is a super-2 number, since 2×21482215² = 922971122612450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21482215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2148217 + ... + 2148226.

It is an arithmetic number, because the mean of its divisors is an integer number (6444666).

Almost surely, 2^21482215 is an apocalyptic number.

21482215 is a deficient number, since it is larger than the sum of its proper divisors (4296449).

21482215 is an equidigital number, since it uses as much as digits as its factorization.

21482215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4296448.

The product of its digits is 1280, while the sum is 25.

The square root of 21482215 is about 4634.8910451056. The cubic root of 21482215 is about 277.9881945541.

The spelling of 21482215 in words is "twenty-one million, four hundred eighty-two thousand, two hundred fifteen".