21011718080 has 112 divisors (see below), whose sum is σ = 52797821760. Its totient is φ = 7948689408.

The previous prime is 21011718059. The next prime is 21011718139. The reversal of 21011718080 is 8081711012.

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 15 ways as a sum of consecutive naturals, for example, 639002 + ... + 671078.

Almost surely, 2^21011718080 is an apocalyptic number.

21011718080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21011718080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26398910880).

21011718080 is an abundant number, since it is smaller than the sum of its proper divisors (31786103680).

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

21011718080 is a wasteful number, since it uses less digits than its factorization.

21011718080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32206 (or 32196 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 29.

The spelling of 21011718080 in words is "twenty-one billion, eleven million, seven hundred eighteen thousand, eighty".