21483923 has 2 divisors, whose sum is σ = 21483924. Its totient is φ = 21483922.

The previous prime is 21483919. The next prime is 21483941. The reversal of 21483923 is 32938412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21483923 - 2² = 21483919 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21483923.

It is not a weakly prime, because it can be changed into another prime (21483953) 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, 10741961 + 10741962.

It is an arithmetic number, because the mean of its divisors is an integer number (10741962).

Almost surely, 2^21483923 is an apocalyptic number.

21483923 is a deficient number, since it is larger than the sum of its proper divisors (1).

21483923 is an equidigital number, since it uses as much as digits as its factorization.

21483923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 32.

The square root of 21483923 is about 4635.0752960443. The cubic root of 21483923 is about 277.9955617531.

The spelling of 21483923 in words is "twenty-one million, four hundred eighty-three thousand, nine hundred twenty-three".