21399483 has 8 divisors (see below), whose sum is σ = 32608768. Its totient is φ = 12228264.

The previous prime is 21399479. The next prime is 21399493. The reversal of 21399483 is 38499312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21399483 - 2² = 21399479 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21399473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 509491 + ... + 509532.

It is an arithmetic number, because the mean of its divisors is an integer number (4076096).

Almost surely, 2^21399483 is an apocalyptic number.

21399483 is a deficient number, since it is larger than the sum of its proper divisors (11209285).

21399483 is a wasteful number, since it uses less digits than its factorization.

21399483 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019033.

The product of its digits is 46656, while the sum is 39.

The square root of 21399483 is about 4625.9575225028. The cubic root of 21399483 is about 277.6308740684.

The spelling of 21399483 in words is "twenty-one million, three hundred ninety-nine thousand, four hundred eighty-three".