21743698 has 8 divisors (see below), whose sum is σ = 32832000. Its totient is φ = 10799700.

The previous prime is 21743693. The next prime is 21743699. The reversal of 21743698 is 89634712.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21743698.

It is not an unprimeable number, because it can be changed into a prime (21743693) by changing a digit.

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, 35698 + ... + 36301.

It is an arithmetic number, because the mean of its divisors is an integer number (4104000).

Almost surely, 2^21743698 is an apocalyptic number.

21743698 is a deficient number, since it is larger than the sum of its proper divisors (11088302).

21743698 is a wasteful number, since it uses less digits than its factorization.

21743698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72152.

The product of its digits is 72576, while the sum is 40.

The square root of 21743698 is about 4663.0138322763. The cubic root of 21743698 is about 279.1115461184. Note that the first 3 decimals are identical.

The spelling of 21743698 in words is "twenty-one million, seven hundred forty-three thousand, six hundred ninety-eight".