21098673072 has 160 divisors (see below), whose sum is σ = 64714161600. Its totient is φ = 6558216192.

The previous prime is 21098673049. The next prime is 21098673077. The reversal of 21098673072 is 27037689012.

It is not an unprimeable number, because it can be changed into a prime (21098673077) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 787318 + ... + 813674.

It is an arithmetic number, because the mean of its divisors is an integer number (404463510).

Almost surely, 2^21098673072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21098673072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32357080800).

21098673072 is an abundant number, since it is smaller than the sum of its proper divisors (43615488528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21098673072 is a wasteful number, since it uses less digits than its factorization.

21098673072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26500 (or 26488 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The spelling of 21098673072 in words is "twenty-one billion, ninety-eight million, six hundred seventy-three thousand, seventy-two".