21112122109500 has 96 divisors (see below), whose sum is σ = 68309444024640. Its totient is φ = 5629899225600.

The previous prime is 21112122109499. The next prime is 21112122109531. The reversal of 21112122109500 is 590122121112.

21112122109500 is a `hidden beast` number, since 2 + 1 + 1 + 121 + 22 + 10 + 9 + 500 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 781916949 + ... + 781943948.

It is an arithmetic number, because the mean of its divisors is an integer number (711556708590).

Almost surely, 2^{21112122109500} is an apocalyptic number.

21112122109500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112122109500 is an abundant number, since it is smaller than the sum of its proper divisors (47197321915140).

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

21112122109500 is a wasteful number, since it uses less digits than its factorization.

21112122109500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1563860925 (or 1563860907 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The spelling of 21112122109500 in words is "twenty-one trillion, one hundred twelve billion, one hundred twenty-two million, one hundred nine thousand, five hundred".