21702323 has 2 divisors, whose sum is σ = 21702324. Its totient is φ = 21702322.

The previous prime is 21702311. The next prime is 21702341. The reversal of 21702323 is 32320712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21702323 - 2⁸ = 21702067 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21702295 and 21702304.

It is not a weakly prime, because it can be changed into another prime (21704323) 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, 10851161 + 10851162.

It is an arithmetic number, because the mean of its divisors is an integer number (10851162).

Almost surely, 2^21702323 is an apocalyptic number.

21702323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21702323 is an equidigital number, since it uses as much as digits as its factorization.

21702323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 21702323 is about 4658.5752113710. The cubic root of 21702323 is about 278.9343978886.

The spelling of 21702323 in words is "twenty-one million, seven hundred two thousand, three hundred twenty-three".