21150411045552 has 120 divisors (see below), whose sum is σ = 59849115973920. Its totient is φ = 6972009830400.

The previous prime is 21150411045527. The next prime is 21150411045559. The reversal of 21150411045552 is 25554011405112.

21150411045552 is a `hidden beast` number, since 2 + 1 + 1 + 50 + 4 + 1 + 10 + 45 + 552 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21150411045559) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11335768 + ... + 13069064.

It is an arithmetic number, because the mean of its divisors is an integer number (498742633116).

Almost surely, 2^{21150411045552} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21150411045552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29924557986960).

21150411045552 is an abundant number, since it is smaller than the sum of its proper divisors (38698704928368).

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

21150411045552 is a wasteful number, since it uses less digits than its factorization.

21150411045552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1734251 (or 1734242 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 36.

The spelling of 21150411045552 in words is "twenty-one trillion, one hundred fifty billion, four hundred eleven million, forty-five thousand, five hundred fifty-two".