21155236246112 has 24 divisors (see below), whose sum is σ = 44099334381816. Its totient is φ = 9955405292032.

The previous prime is 21155236246097. The next prime is 21155236246223. The reversal of 21155236246112 is 21164263255112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21155236246112.

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 3 ways as a sum of consecutive naturals, for example, 19444150418 + ... + 19444151505.

It is an arithmetic number, because the mean of its divisors is an integer number (1837472265909).

Almost surely, 2^{21155236246112} is an apocalyptic number.

It is an amenable number.

21155236246112 is an abundant number, since it is smaller than the sum of its proper divisors (22944098135704).

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

21155236246112 is a wasteful number, since it uses less digits than its factorization.

21155236246112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38888301950 (or 38888301942 counting only the distinct ones).

The product of its digits is 172800, while the sum is 41.

The spelling of 21155236246112 in words is "twenty-one trillion, one hundred fifty-five billion, two hundred thirty-six million, two hundred forty-six thousand, one hundred twelve".