21159698 has 16 divisors (see below), whose sum is σ = 37118400. Its totient is φ = 8857296.

The previous prime is 21159689. The next prime is 21159709. The reversal of 21159698 is 89695112.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16973 + ... + 18176.

It is an arithmetic number, because the mean of its divisors is an integer number (2319900).

Almost surely, 2^21159698 is an apocalyptic number.

21159698 is a deficient number, since it is larger than the sum of its proper divisors (15958702).

21159698 is a wasteful number, since it uses less digits than its factorization.

21159698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35201.

The product of its digits is 38880, while the sum is 41.

The square root of 21159698 is about 4599.9671737959. The cubic root of 21159698 is about 276.5900089227.

The spelling of 21159698 in words is "twenty-one million, one hundred fifty-nine thousand, six hundred ninety-eight".