21930423 has 8 divisors (see below), whose sum is σ = 30183936. Its totient is φ = 14148600.

The previous prime is 21930421. The next prime is 21930443. The reversal of 21930423 is 32403912.

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

It is not a de Polignac number, because 21930423 - 2¹ = 21930421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21930393 and 21930402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21930421) 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, 117813 + ... + 117998.

It is an arithmetic number, because the mean of its divisors is an integer number (3772992).

Almost surely, 2^21930423 is an apocalyptic number.

21930423 is a deficient number, since it is larger than the sum of its proper divisors (8253513).

21930423 is a wasteful number, since it uses less digits than its factorization.

21930423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235845.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 21930423 is about 4682.9929532298. The cubic root of 21930423 is about 279.9082309807.

The spelling of 21930423 in words is "twenty-one million, nine hundred thirty thousand, four hundred twenty-three".