21979133 has 8 divisors (see below), whose sum is σ = 24225600. Its totient is φ = 19774080.

The previous prime is 21979121. The next prime is 21979151. The reversal of 21979133 is 33197912.

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

It is a cyclic number.

It is not a de Polignac number, because 21979133 - 2⁴ = 21979117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21979093 and 21979102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21979163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9233 + ... + 11366.

It is an arithmetic number, because the mean of its divisors is an integer number (3028200).

Almost surely, 2^21979133 is an apocalyptic number.

It is an amenable number.

21979133 is a deficient number, since it is larger than the sum of its proper divisors (2246467).

21979133 is a wasteful number, since it uses less digits than its factorization.

21979133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20707.

The product of its digits is 10206, while the sum is 35.

The square root of 21979133 is about 4688.1908024311. The cubic root of 21979133 is about 280.1153138977.

The spelling of 21979133 in words is "twenty-one million, nine hundred seventy-nine thousand, one hundred thirty-three".