21985233 has 8 divisors (see below), whose sum is σ = 31038048. Its totient is φ = 13794624.

The previous prime is 21985211. The next prime is 21985241. The reversal of 21985233 is 33258912.

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

It is not a de Polignac number, because 21985233 - 2¹² = 21981137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21985194 and 21985203.

It is not an unprimeable number, because it can be changed into a prime (21985253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215491 + ... + 215592.

It is an arithmetic number, because the mean of its divisors is an integer number (3879756).

Almost surely, 2^21985233 is an apocalyptic number.

It is an amenable number.

21985233 is a deficient number, since it is larger than the sum of its proper divisors (9052815).

21985233 is a wasteful number, since it uses less digits than its factorization.

21985233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431103.

The product of its digits is 12960, while the sum is 33.

The square root of 21985233 is about 4688.8413280895. The cubic root of 21985233 is about 280.1412255258.

The spelling of 21985233 in words is "twenty-one million, nine hundred eighty-five thousand, two hundred thirty-three".