21488115 has 32 divisors (see below), whose sum is σ = 38725632. Its totient is φ = 10080000.

The previous prime is 21488113. The next prime is 21488143. The reversal of 21488115 is 51188412.

It is a happy number.

It is not a de Polignac number, because 21488115 - 2¹ = 21488113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21488113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3015 + ... + 7215.

It is an arithmetic number, because the mean of its divisors is an integer number (1210176).

Almost surely, 2^21488115 is an apocalyptic number.

21488115 is a deficient number, since it is larger than the sum of its proper divisors (17237517).

21488115 is a wasteful number, since it uses less digits than its factorization.

21488115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4251.

The product of its digits is 2560, while the sum is 30.

The square root of 21488115 is about 4635.5274780763. The cubic root of 21488115 is about 278.0136416541.

The spelling of 21488115 in words is "twenty-one million, four hundred eighty-eight thousand, one hundred fifteen".