21719042 has 16 divisors (see below), whose sum is σ = 33815232. Its totient is φ = 10454640.

The previous prime is 21719041. The next prime is 21719051. The reversal of 21719042 is 24091712.

It is not an unprimeable number, because it can be changed into a prime (21719041) 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, 4328 + ... + 7884.

It is an arithmetic number, because the mean of its divisors is an integer number (2113452).

Almost surely, 2^21719042 is an apocalyptic number.

21719042 is a deficient number, since it is larger than the sum of its proper divisors (12096190).

21719042 is a wasteful number, since it uses less digits than its factorization.

21719042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3673.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 21719042 is about 4660.3692986715. The cubic root of 21719042 is about 279.0060078441.

The spelling of 21719042 in words is "twenty-one million, seven hundred nineteen thousand, forty-two".