21842963 has 2 divisors, whose sum is σ = 21842964. Its totient is φ = 21842962.

The previous prime is 21842959. The next prime is 21842969. The reversal of 21842963 is 36924812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21842963 - 2² = 21842959 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21842969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10921481 + 10921482.

It is an arithmetic number, because the mean of its divisors is an integer number (10921482).

Almost surely, 2^21842963 is an apocalyptic number.

21842963 is a deficient number, since it is larger than the sum of its proper divisors (1).

21842963 is an equidigital number, since it uses as much as digits as its factorization.

21842963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 35.

The square root of 21842963 is about 4673.6455792026. The cubic root of 21842963 is about 279.5356376229.

The spelling of 21842963 in words is "twenty-one million, eight hundred forty-two thousand, nine hundred sixty-three".