21488415 has 32 divisors (see below), whose sum is σ = 37255680. Its totient is φ = 10513536.

The previous prime is 21488399. The next prime is 21488429. The reversal of 21488415 is 51488412.

It is not a de Polignac number, because 21488415 - 2⁴ = 21488399 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51076 + ... + 51494.

It is an arithmetic number, because the mean of its divisors is an integer number (1164240).

Almost surely, 2^21488415 is an apocalyptic number.

21488415 is a deficient number, since it is larger than the sum of its proper divisors (15767265).

21488415 is a wasteful number, since it uses less digits than its factorization.

21488415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703.

The product of its digits is 10240, while the sum is 33.

The square root of 21488415 is about 4635.5598367403. The cubic root of 21488415 is about 278.0149354500.

The spelling of 21488415 in words is "twenty-one million, four hundred eighty-eight thousand, four hundred fifteen".