21674698 has 4 divisors (see below), whose sum is σ = 32512050. Its totient is φ = 10837348.

The previous prime is 21674693. The next prime is 21674699. The reversal of 21674698 is 89647612.

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

It can be written as a sum of positive squares in only one way, i.e., 21594609 + 80089 = 4647^2 + 283^2 .

It is not an unprimeable number, because it can be changed into a prime (21674693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5418673 + ... + 5418676.

Almost surely, 2^21674698 is an apocalyptic number.

21674698 is a deficient number, since it is larger than the sum of its proper divisors (10837352).

21674698 is a wasteful number, since it uses less digits than its factorization.

21674698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10837351.

The product of its digits is 145152, while the sum is 43.

The square root of 21674698 is about 4655.6093049138. The cubic root of 21674698 is about 278.8159952866.

The spelling of 21674698 in words is "twenty-one million, six hundred seventy-four thousand, six hundred ninety-eight".