21994983 has 40 divisors (see below), whose sum is σ = 34760880. Its totient is φ = 13841280.

The previous prime is 21994981. The next prime is 21994993. The reversal of 21994983 is 38949912.

It is not a de Polignac number, because 21994983 - 2¹ = 21994981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21994981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 122788 + ... + 122966.

It is an arithmetic number, because the mean of its divisors is an integer number (869022).

Almost surely, 2^21994983 is an apocalyptic number.

21994983 is a deficient number, since it is larger than the sum of its proper divisors (12765897).

21994983 is a wasteful number, since it uses less digits than its factorization.

21994983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269 (or 260 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 21994983 is about 4689.8809153325. The cubic root of 21994983 is about 280.1826317018.

Adding to 21994983 its sum of digits (45), we get a triangular number (21995028 = T₆₆₃₂).

The spelling of 21994983 in words is "twenty-one million, nine hundred ninety-four thousand, nine hundred eighty-three".