21419723 has 8 divisors (see below), whose sum is σ = 23446416. Its totient is φ = 19447200.

The previous prime is 21419701. The next prime is 21419731. The reversal of 21419723 is 32791412.

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 21419723 - 2⁸ = 21419467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21419623) 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, 12713 + ... + 14298.

It is an arithmetic number, because the mean of its divisors is an integer number (2930802).

Almost surely, 2^21419723 is an apocalyptic number.

21419723 is a deficient number, since it is larger than the sum of its proper divisors (2026693).

21419723 is a wasteful number, since it uses less digits than its factorization.

21419723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27085.

The product of its digits is 3024, while the sum is 29.

The square root of 21419723 is about 4628.1446606605. The cubic root of 21419723 is about 277.7183758432.

The spelling of 21419723 in words is "twenty-one million, four hundred nineteen thousand, seven hundred twenty-three".