21989646598 has 8 divisors (see below), whose sum is σ = 32989045608. Its totient is φ = 10993298064.

The previous prime is 21989646509. The next prime is 21989646607. The reversal of 21989646598 is 89564698912.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 744511 + ... + 773482.

It is an arithmetic number, because the mean of its divisors is an integer number (4123630701).

Almost surely, 2^21989646598 is an apocalyptic number.

21989646598 is a deficient number, since it is larger than the sum of its proper divisors (10999399010).

21989646598 is a wasteful number, since it uses less digits than its factorization.

21989646598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1525238.

The product of its digits is 67184640, while the sum is 67.

The spelling of 21989646598 in words is "twenty-one billion, nine hundred eighty-nine million, six hundred forty-six thousand, five hundred ninety-eight".