21375435727044 has 144 divisors (see below), whose sum is σ = 61795072475136. Its totient is φ = 6102936100800.

The previous prime is 21375435727007. The next prime is 21375435727099. The reversal of 21375435727044 is 44072753457312.

21375435727044 is a `hidden beast` number, since 2 + 1 + 3 + 7 + 543 + 57 + 2 + 7 + 0 + 44 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3408613629 + ... + 3408619899.

It is an arithmetic number, because the mean of its divisors is an integer number (429132447744).

Almost surely, 2^{21375435727044} is an apocalyptic number.

It is an amenable number.

21375435727044 is an abundant number, since it is smaller than the sum of its proper divisors (40419636748092).

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

21375435727044 is a wasteful number, since it uses less digits than its factorization.

21375435727044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13726 (or 13721 counting only the distinct ones).

The product of its (nonzero) digits is 19756800, while the sum is 54.

The spelling of 21375435727044 in words is "twenty-one trillion, three hundred seventy-five billion, four hundred thirty-five million, seven hundred twenty-seven thousand, forty-four".