21942283 has 8 divisors (see below), whose sum is σ = 25197120. Its totient is φ = 18897480.

The previous prime is 21942281. The next prime is 21942287. The reversal of 21942283 is 38224912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21942283 - 2¹ = 21942281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21942281) 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 in 7 ways as a sum of consecutive naturals, for example, 52285 + ... + 52702.

It is an arithmetic number, because the mean of its divisors is an integer number (3149640).

Almost surely, 2^21942283 is an apocalyptic number.

21942283 is a deficient number, since it is larger than the sum of its proper divisors (3254837).

21942283 is a wasteful number, since it uses less digits than its factorization.

21942283 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105017.

The product of its digits is 6912, while the sum is 31.

The square root of 21942283 is about 4684.2590662772. The cubic root of 21942283 is about 279.9586801272.

The spelling of 21942283 in words is "twenty-one million, nine hundred forty-two thousand, two hundred eighty-three".