21154555445124 has 24 divisors (see below), whose sum is σ = 49500461193120. Its totient is φ = 7031542507264.

The previous prime is 21154555445047. The next prime is 21154555445167. The reversal of 21154555445124 is 42154455545112.

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, 2496992394 + ... + 2497000865.

It is an arithmetic number, because the mean of its divisors is an integer number (2062519216380).

Almost surely, 2^{21154555445124} is an apocalyptic number.

It is an amenable number.

21154555445124 is an abundant number, since it is smaller than the sum of its proper divisors (28345905747996).

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

21154555445124 is a wasteful number, since it uses less digits than its factorization.

21154555445124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4993993619 (or 4993993617 counting only the distinct ones).

The product of its digits is 3200000, while the sum is 48.

The spelling of 21154555445124 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred fifty-five million, four hundred forty-five thousand, one hundred twenty-four".