21423926 has 8 divisors (see below), whose sum is σ = 32164464. Its totient is φ = 10702440.

The previous prime is 21423917. The next prime is 21423959. The reversal of 21423926 is 62932412.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1505 + ... + 6716.

It is an arithmetic number, because the mean of its divisors is an integer number (4020558).

Almost surely, 2^21423926 is an apocalyptic number.

21423926 is a deficient number, since it is larger than the sum of its proper divisors (10740538).

21423926 is a wasteful number, since it uses less digits than its factorization.

21423926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9526.

The product of its digits is 5184, while the sum is 29.

The square root of 21423926 is about 4628.5987080325. The cubic root of 21423926 is about 277.7365393833.

The spelling of 21423926 in words is "twenty-one million, four hundred twenty-three thousand, nine hundred twenty-six".