21913461998 has 4 divisors (see below), whose sum is σ = 32870193000. Its totient is φ = 10956730998.

The previous prime is 21913461989. The next prime is 21913462013. The reversal of 21913461998 is 89916431912.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

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 as a sum of consecutive naturals, namely, 5478365498 + ... + 5478365501.

It is an arithmetic number, because the mean of its divisors is an integer number (8217548250).

Almost surely, 2^21913461998 is an apocalyptic number.

21913461998 is a deficient number, since it is larger than the sum of its proper divisors (10956731002).

21913461998 is a wasteful number, since it uses less digits than its factorization.

21913461998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10956731001.

The product of its digits is 839808, while the sum is 53.

The spelling of 21913461998 in words is "twenty-one billion, nine hundred thirteen million, four hundred sixty-one thousand, nine hundred ninety-eight".