21399482 has 16 divisors (see below), whose sum is σ = 34663272. Its totient is φ = 9849600.

The previous prime is 21399479. The next prime is 21399493. The reversal of 21399482 is 28499312.

It can be written as a sum of positive squares in 4 ways, for example, as 14737921 + 6661561 = 3839^2 + 2581^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10982 + ... + 12782.

Almost surely, 2^21399482 is an apocalyptic number.

21399482 is a deficient number, since it is larger than the sum of its proper divisors (13263790).

21399482 is a wasteful number, since it uses less digits than its factorization.

21399482 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2273.

The product of its digits is 31104, while the sum is 38.

The square root of 21399482 is about 4625.9574144170. The cubic root of 21399482 is about 277.6308697438.

The spelling of 21399482 in words is "twenty-one million, three hundred ninety-nine thousand, four hundred eighty-two".