21078173480 has 192 divisors, whose sum is σ = 60588518400. Its totient is φ = 6455255040.

The previous prime is 21078173437. The next prime is 21078173539. The reversal of 21078173480 is 8437187012.

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 47 ways as a sum of consecutive naturals, for example, 1459736 + ... + 1474104.

It is an arithmetic number, because the mean of its divisors is an integer number (315565200).

Almost surely, 2^21078173480 is an apocalyptic number.

21078173480 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 21078173480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30294259200).

21078173480 is an abundant number, since it is smaller than the sum of its proper divisors (39510344920).

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

21078173480 is a wasteful number, since it uses less digits than its factorization.

21078173480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14444 (or 14427 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 41.

The spelling of 21078173480 in words is "twenty-one billion, seventy-eight million, one hundred seventy-three thousand, four hundred eighty".