21968698 has 8 divisors (see below), whose sum is σ = 33011892. Its totient is φ = 10964736.

The previous prime is 21968663. The next prime is 21968699. The reversal of 21968698 is 89686912.

It is a happy number.

21968698 is nontrivially palindromic in base 7.

It can be written as a sum of positive squares in 2 ways, for example, as 21967969 + 729 = 4687^2 + 27^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21968699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8365 + ... + 10672.

Almost surely, 2^21968698 is an apocalyptic number.

21968698 is a deficient number, since it is larger than the sum of its proper divisors (11043194).

21968698 is a wasteful number, since it uses less digits than its factorization.

21968698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19616.

The product of its digits is 373248, while the sum is 49.

The square root of 21968698 is about 4687.0777676501. The cubic root of 21968698 is about 280.0709769046.

The spelling of 21968698 in words is "twenty-one million, nine hundred sixty-eight thousand, six hundred ninety-eight".