21999982 has 8 divisors (see below), whose sum is σ = 33622776. Its totient is φ = 10792392.

The previous prime is 21999977. The next prime is 22000001. The reversal of 21999982 is 28999912.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103668 + ... + 103879.

It is an arithmetic number, because the mean of its divisors is an integer number (4202847).

Almost surely, 2^21999982 is an apocalyptic number.

21999982 is a deficient number, since it is larger than the sum of its proper divisors (11622794).

21999982 is a wasteful number, since it uses less digits than its factorization.

21999982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207602.

The product of its digits is 209952, while the sum is 49.

The square root of 21999982 is about 4690.4138410166. The cubic root of 21999982 is about 280.2038566463.

The spelling of 21999982 in words is "twenty-one million, nine hundred ninety-nine thousand, nine hundred eighty-two".