21233678 has 8 divisors (see below), whose sum is σ = 33526920. Its totient is φ = 10058040.

The previous prime is 21233651. The next prime is 21233689. The reversal of 21233678 is 87633212.

It is a happy number.

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

It is a Curzon number.

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, 279353 + ... + 279428.

It is an arithmetic number, because the mean of its divisors is an integer number (4190865).

Almost surely, 2^21233678 is an apocalyptic number.

21233678 is a deficient number, since it is larger than the sum of its proper divisors (12293242).

21233678 is a wasteful number, since it uses less digits than its factorization.

21233678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558802.

The product of its digits is 12096, while the sum is 32.

The square root of 21233678 is about 4608.0015190970. The cubic root of 21233678 is about 276.9119783578.

The spelling of 21233678 in words is "twenty-one million, two hundred thirty-three thousand, six hundred seventy-eight".