21719414 has 8 divisors (see below), whose sum is σ = 32638680. Its totient is φ = 10839856.

The previous prime is 21719393. The next prime is 21719419. The reversal of 21719414 is 41491712.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21719419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8519 + ... + 10770.

It is an arithmetic number, because the mean of its divisors is an integer number (4079835).

Almost surely, 2^21719414 is an apocalyptic number.

21719414 is a deficient number, since it is larger than the sum of its proper divisors (10919266).

21719414 is a wasteful number, since it uses less digits than its factorization.

21719414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19854.

The product of its digits is 2016, while the sum is 29.

The square root of 21719414 is about 4660.4092095008. The cubic root of 21719414 is about 279.0076007573.

The spelling of 21719414 in words is "twenty-one million, seven hundred nineteen thousand, four hundred fourteen".