21926 has 8 divisors (see below), whose sum is σ = 34680. Its totient is φ = 10368.

The previous prime is 21911. The next prime is 21929. The reversal of 21926 is 62912.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21898 and 21907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21929) 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, 251 + ... + 326.

It is an arithmetic number, because the mean of its divisors is an integer number (4335).

2²¹⁹²⁶ is an apocalyptic number.

21926 is a deficient number, since it is larger than the sum of its proper divisors (12754).

21926 is a wasteful number, since it uses less digits than its factorization.

21926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598.

The product of its digits is 216, while the sum is 20.

The square root of 21926 is about 148.0743056712. The cubic root of 21926 is about 27.9889412111.

The spelling of 21926 in words is "twenty-one thousand, nine hundred twenty-six".