21919733 has 8 divisors (see below), whose sum is σ = 24039936. Its totient is φ = 19820800.

The previous prime is 21919669. The next prime is 21919741. The reversal of 21919733 is 33791912.

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 21919733 - 2⁶ = 21919669 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21919693 and 21919702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21919753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3116 + ... + 7317.

It is an arithmetic number, because the mean of its divisors is an integer number (3004992).

Almost surely, 2^21919733 is an apocalyptic number.

It is an amenable number.

21919733 is a deficient number, since it is larger than the sum of its proper divisors (2120203).

21919733 is a wasteful number, since it uses less digits than its factorization.

21919733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10635.

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

The square root of 21919733 is about 4681.8514500142. The cubic root of 21919733 is about 279.8627431014.

The spelling of 21919733 in words is "twenty-one million, nine hundred nineteen thousand, seven hundred thirty-three".