21911698 has 8 divisors (see below), whose sum is σ = 32887692. Its totient is φ = 10949136.

The previous prime is 21911689. The next prime is 21911713. The reversal of 21911698 is 89611912.

It can be written as a sum of positive squares in 2 ways, for example, as 20097289 + 1814409 = 4483^2 + 1347^2 .

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

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, 3636 + ... + 7552.

Almost surely, 2^21911698 is an apocalyptic number.

21911698 is a deficient number, since it is larger than the sum of its proper divisors (10975994).

21911698 is a wasteful number, since it uses less digits than its factorization.

21911698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6716.

The product of its digits is 7776, while the sum is 37.

The square root of 21911698 is about 4680.9932706638. The cubic root of 21911698 is about 279.8285429895.

The spelling of 21911698 in words is "twenty-one million, nine hundred eleven thousand, six hundred ninety-eight".