21417488 has 20 divisors (see below), whose sum is σ = 42117840. Its totient is φ = 10548384.

The previous prime is 21417481. The next prime is 21417491. The reversal of 21417488 is 88471412.

It is not an unprimeable number, because it can be changed into a prime (21417481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8918 + ... + 11061.

It is an arithmetic number, because the mean of its divisors is an integer number (2105892).

Almost surely, 2^21417488 is an apocalyptic number.

It is an amenable number.

21417488 is a deficient number, since it is larger than the sum of its proper divisors (20700352).

21417488 is a wasteful number, since it uses less digits than its factorization.

21417488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20054 (or 20048 counting only the distinct ones).

The product of its digits is 14336, while the sum is 35.

The square root of 21417488 is about 4627.9031969133. The cubic root of 21417488 is about 277.7087161764.

The spelling of 21417488 in words is "twenty-one million, four hundred seventeen thousand, four hundred eighty-eight".