21719033 has 16 divisors (see below), whose sum is σ = 26497920. Its totient is φ = 17387136.

The previous prime is 21719023. The next prime is 21719041. The reversal of 21719033 is 33091712.

It is a cyclic number.

It is not a de Polignac number, because 21719033 - 2⁸ = 21718777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21718993 and 21719011.

It is not an unprimeable number, because it can be changed into a prime (21719023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8591 + ... + 10827.

It is an arithmetic number, because the mean of its divisors is an integer number (1656120).

Almost surely, 2^21719033 is an apocalyptic number.

It is an amenable number.

21719033 is a deficient number, since it is larger than the sum of its proper divisors (4778887).

21719033 is a wasteful number, since it uses less digits than its factorization.

21719033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2336.

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 21719033 is about 4660.3683330827. The cubic root of 21719033 is about 279.0059693057.

The spelling of 21719033 in words is "twenty-one million, seven hundred nineteen thousand, thirty-three".