21382115 has 16 divisors (see below), whose sum is σ = 27004320. Its totient is φ = 16231680.

The previous prime is 21382103. The next prime is 21382121. The reversal of 21382115 is 51128312.

It is a happy number.

It is not a de Polignac number, because 21382115 - 2⁴ = 21382099 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6176 + ... + 8994.

It is an arithmetic number, because the mean of its divisors is an integer number (1687770).

Almost surely, 2^21382115 is an apocalyptic number.

21382115 is a deficient number, since it is larger than the sum of its proper divisors (5622205).

21382115 is a wasteful number, since it uses less digits than its factorization.

21382115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2902.

The product of its digits is 480, while the sum is 23.

The square root of 21382115 is about 4624.0799084791. The cubic root of 21382115 is about 277.5557445570. Note that the first 3 decimals are identical.

It can be divided in two parts, 213 and 82115, that added together give a palindrome (82328).

The spelling of 21382115 in words is "twenty-one million, three hundred eighty-two thousand, one hundred fifteen".