21833997 has 8 divisors (see below), whose sum is σ = 29223744. Its totient is φ = 14500128.

The previous prime is 21833963. The next prime is 21834011. The reversal of 21833997 is 79933812.

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

It is not a de Polignac number, because 21833997 - 2¹⁰ = 21832973 is a prime.

It is a super-3 number, since 3×21833997³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21833957) 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, 13048 + ... + 14625.

It is an arithmetic number, because the mean of its divisors is an integer number (3652968).

Almost surely, 2^21833997 is an apocalyptic number.

It is an amenable number.

21833997 is a deficient number, since it is larger than the sum of its proper divisors (7389747).

21833997 is a wasteful number, since it uses less digits than its factorization.

21833997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27939.

The product of its digits is 81648, while the sum is 42.

The square root of 21833997 is about 4672.6862723705. The cubic root of 21833997 is about 279.4973848832.

The spelling of 21833997 in words is "twenty-one million, eight hundred thirty-three thousand, nine hundred ninety-seven".