21155002552112 has 160 divisors (see below), whose sum is σ = 48415026240000. Its totient is φ = 8828057272320.

The previous prime is 21155002552039. The next prime is 21155002552133. The reversal of 21155002552112 is 21125520055112.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1338154064 + ... + 1338169872.

It is an arithmetic number, because the mean of its divisors is an integer number (302593914000).

Almost surely, 2^{21155002552112} is an apocalyptic number.

21155002552112 is a gapful number since it is divisible by the number (22) 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 21155002552112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24207513120000).

21155002552112 is an abundant number, since it is smaller than the sum of its proper divisors (27260023687888).

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

21155002552112 is a wasteful number, since it uses less digits than its factorization.

21155002552112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18979 (or 18973 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 32.

The spelling of 21155002552112 in words is "twenty-one trillion, one hundred fifty-five billion, two million, five hundred fifty-two thousand, one hundred twelve".