21926123 has 2 divisors, whose sum is σ = 21926124. Its totient is φ = 21926122.

The previous prime is 21926077. The next prime is 21926131. The reversal of 21926123 is 32162912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21926123 - 2¹⁸ = 21663979 is a prime.

It is a super-2 number, since 2×21926123² = 961509739622258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21926092 and 21926101.

It is not a weakly prime, because it can be changed into another prime (21922123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10963061 + 10963062.

It is an arithmetic number, because the mean of its divisors is an integer number (10963062).

Almost surely, 2^21926123 is an apocalyptic number.

21926123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21926123 is an equidigital number, since it uses as much as digits as its factorization.

21926123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 26.

The square root of 21926123 is about 4682.5338226221. The cubic root of 21926123 is about 279.8899354822.

The spelling of 21926123 in words is "twenty-one million, nine hundred twenty-six thousand, one hundred twenty-three".