21113510551144 has 64 divisors (see below), whose sum is σ = 43310725920000. Its totient is φ = 9569504536320.

The previous prime is 21113510551123. The next prime is 21113510551153. The reversal of 21113510551144 is 44115501531112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181097382 + ... + 181213930.

It is an arithmetic number, because the mean of its divisors is an integer number (676730092500).

Almost surely, 2^{21113510551144} is an apocalyptic number.

It is an amenable number.

21113510551144 is an abundant number, since it is smaller than the sum of its proper divisors (22197215368856).

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

21113510551144 is a wasteful number, since it uses less digits than its factorization.

21113510551144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122458 (or 122454 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 34.

The spelling of 21113510551144 in words is "twenty-one trillion, one hundred thirteen billion, five hundred ten million, five hundred fifty-one thousand, one hundred forty-four".