21144698 has 8 divisors (see below), whose sum is σ = 32013792. Its totient is φ = 10473436.

The previous prime is 21144679. The next prime is 21144703. The reversal of 21144698 is 89644112.

It is a happy number.

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

It is a super-2 number, since 2×21144698² = 894196507022408, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49190 + ... + 49617.

It is an arithmetic number, because the mean of its divisors is an integer number (4001724).

Almost surely, 2^21144698 is an apocalyptic number.

21144698 is a deficient number, since it is larger than the sum of its proper divisors (10869094).

21144698 is a wasteful number, since it uses less digits than its factorization.

21144698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98916.

The product of its digits is 13824, while the sum is 35.

The square root of 21144698 is about 4598.3364383220. The cubic root of 21144698 is about 276.5246357325.

The spelling of 21144698 in words is "twenty-one million, one hundred forty-four thousand, six hundred ninety-eight".