21342023 has 2 divisors, whose sum is σ = 21342024. Its totient is φ = 21342022.

The previous prime is 21342001. The next prime is 21342031. The reversal of 21342023 is 32024312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21342023 - 2¹⁶ = 21276487 is a prime.

It is equal to p_1350215 and since 21342023 and 1350215 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 21341992 and 21342010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21342053) 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, 10671011 + 10671012.

It is an arithmetic number, because the mean of its divisors is an integer number (10671012).

Almost surely, 2^21342023 is an apocalyptic number.

21342023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21342023 is an equidigital number, since it uses as much as digits as its factorization.

21342023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 21342023 is about 4619.7427417552. The cubic root of 21342023 is about 277.3821613682.

Adding to 21342023 its reverse (32024312), we get a palindrome (53366335).

The spelling of 21342023 in words is "twenty-one million, three hundred forty-two thousand, twenty-three".