21798926 has 4 divisors (see below), whose sum is σ = 32698392. Its totient is φ = 10899462.

The previous prime is 21798911. The next prime is 21798961. The reversal of 21798926 is 62989712.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5449730 + ... + 5449733.

It is an arithmetic number, because the mean of its divisors is an integer number (8174598).

Almost surely, 2^21798926 is an apocalyptic number.

21798926 is a deficient number, since it is larger than the sum of its proper divisors (10899466).

21798926 is a wasteful number, since it uses less digits than its factorization.

21798926 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10899465.

The product of its digits is 108864, while the sum is 44.

The square root of 21798926 is about 4668.9319977914. The cubic root of 21798926 is about 279.3476565217.

The spelling of 21798926 in words is "twenty-one million, seven hundred ninety-eight thousand, nine hundred twenty-six".