21836998 has 4 divisors (see below), whose sum is σ = 32755500. Its totient is φ = 10918498.

The previous prime is 21836981. The next prime is 21837019. The reversal of 21836998 is 89963812.

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, 5459248 + ... + 5459251.

It is an arithmetic number, because the mean of its divisors is an integer number (8188875).

Almost surely, 2^21836998 is an apocalyptic number.

21836998 is a deficient number, since it is larger than the sum of its proper divisors (10918502).

21836998 is a wasteful number, since it uses less digits than its factorization.

21836998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10918501.

The product of its digits is 186624, while the sum is 46.

The square root of 21836998 is about 4673.0073828317. The cubic root of 21836998 is about 279.5101895814.

The spelling of 21836998 in words is "twenty-one million, eight hundred thirty-six thousand, nine hundred ninety-eight".