21234923 has 2 divisors, whose sum is σ = 21234924. Its totient is φ = 21234922.

The previous prime is 21234877. The next prime is 21234937. The reversal of 21234923 is 32943212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21234923 - 2⁸ = 21234667 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21234892 and 21234901.

It is not a weakly prime, because it can be changed into another prime (21234953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617461 + 10617462.

It is an arithmetic number, because the mean of its divisors is an integer number (10617462).

Almost surely, 2^21234923 is an apocalyptic number.

21234923 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234923 is an equidigital number, since it uses as much as digits as its factorization.

21234923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 26.

The square root of 21234923 is about 4608.1366082181. The cubic root of 21234923 is about 276.9173903371.

The spelling of 21234923 in words is "twenty-one million, two hundred thirty-four thousand, nine hundred twenty-three".