21111550412000 has 48 divisors (see below), whose sum is σ = 51871079372112. Its totient is φ = 8444620163200.

The previous prime is 21111550411999. The next prime is 21111550412033. The reversal of 21111550412000 is 21405511112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2638939802 + ... + 2638947801.

It is an arithmetic number, because the mean of its divisors is an integer number (1080647486919).

Almost surely, 2^{21111550412000} is an apocalyptic number.

21111550412000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111550412000 is an abundant number, since it is smaller than the sum of its proper divisors (30759528960112).

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

21111550412000 is an equidigital number, since it uses as much as digits as its factorization.

21111550412000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5277887628 (or 5277887610 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 23.

Adding to 21111550412000 its reverse (21405511112), we get a palindrome (21132955923112).

The spelling of 21111550412000 in words is "twenty-one trillion, one hundred eleven billion, five hundred fifty million, four hundred twelve thousand".