21424983 has 8 divisors (see below), whose sum is σ = 29808768. Its totient is φ = 13662264.

The previous prime is 21424973. The next prime is 21425003. The reversal of 21424983 is 38942412.

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

It is not a de Polignac number, because 21424983 - 2⁴ = 21424967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21424943) 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, 155185 + ... + 155322.

It is an arithmetic number, because the mean of its divisors is an integer number (3726096).

Almost surely, 2^21424983 is an apocalyptic number.

21424983 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21424983 is a deficient number, since it is larger than the sum of its proper divisors (8383785).

21424983 is a wasteful number, since it uses less digits than its factorization.

21424983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310533.

The product of its digits is 13824, while the sum is 33.

The square root of 21424983 is about 4628.7128880500. The cubic root of 21424983 is about 277.7411069043.

The spelling of 21424983 in words is "twenty-one million, four hundred twenty-four thousand, nine hundred eighty-three".