21479983 has 12 divisors (see below), whose sum is σ = 25091400. Its totient is φ = 18334512.

The previous prime is 21479963. The next prime is 21480001. The reversal of 21479983 is 38997412.

It is not a de Polignac number, because 21479983 - 2¹⁷ = 21348911 is a prime.

It is a super-2 number, since 2×21479983² = 922779339360578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21479963) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 13093 + ... + 14641.

It is an arithmetic number, because the mean of its divisors is an integer number (2090950).

Almost surely, 2^21479983 is an apocalyptic number.

21479983 is a deficient number, since it is larger than the sum of its proper divisors (3611417).

21479983 is a wasteful number, since it uses less digits than its factorization.

21479983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1846 (or 1839 counting only the distinct ones).

The product of its digits is 108864, while the sum is 43.

The square root of 21479983 is about 4634.6502564919. The cubic root of 21479983 is about 277.9785665721.

The spelling of 21479983 in words is "twenty-one million, four hundred seventy-nine thousand, nine hundred eighty-three".