21154555443352 has 8 divisors (see below), whose sum is σ = 39664791456300. Its totient is φ = 10577277721672.

The previous prime is 21154555443341. The next prime is 21154555443403. The reversal of 21154555443352 is 25334455545112.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21154555443296 and 21154555443305.

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 as a sum of consecutive naturals, namely, 1322159715202 + ... + 1322159715217.

Almost surely, 2^{21154555443352} is an apocalyptic number.

It is an amenable number.

21154555443352 is a deficient number, since it is larger than the sum of its proper divisors (18510236012948).

21154555443352 is a wasteful number, since it uses less digits than its factorization.

21154555443352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2644319430425 (or 2644319430421 counting only the distinct ones).

The product of its digits is 7200000, while the sum is 49.

The spelling of 21154555443352 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred fifty-five million, four hundred forty-three thousand, three hundred fifty-two".