21719467 has 8 divisors (see below), whose sum is σ = 27078912. Its totient is φ = 16924200.

The previous prime is 21719461. The next prime is 21719479. The reversal of 21719467 is 76491712.

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 21719467 - 2³ = 21719459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21719461) 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, 140959 + ... + 141112.

It is an arithmetic number, because the mean of its divisors is an integer number (3384864).

Almost surely, 2^21719467 is an apocalyptic number.

21719467 is a deficient number, since it is larger than the sum of its proper divisors (5359445).

21719467 is a wasteful number, since it uses less digits than its factorization.

21719467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282089.

The product of its digits is 21168, while the sum is 37.

The square root of 21719467 is about 4660.4148956933. The cubic root of 21719467 is about 279.0078277031.

The spelling of 21719467 in words is "twenty-one million, seven hundred nineteen thousand, four hundred sixty-seven".