21739131898 has 8 divisors (see below), whose sum is σ = 35573124960. Its totient is φ = 9881423580.

The previous prime is 21739131859. The next prime is 21739131913. The reversal of 21739131898 is 89813193712.

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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494071158 + ... + 494071201.

It is an arithmetic number, because the mean of its divisors is an integer number (4446640620).

Almost surely, 2^21739131898 is an apocalyptic number.

21739131898 is a deficient number, since it is larger than the sum of its proper divisors (13833993062).

21739131898 is a wasteful number, since it uses less digits than its factorization.

21739131898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988142372.

The product of its digits is 653184, while the sum is 52.

The spelling of 21739131898 in words is "twenty-one billion, seven hundred thirty-nine million, one hundred thirty-one thousand, eight hundred ninety-eight".