21375064541444 has 48 divisors (see below), whose sum is σ = 40415507798400. Its totient is φ = 9854615625216.

The previous prime is 21375064541377. The next prime is 21375064541449. The reversal of 21375064541444 is 44414546057312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21375064541392 and 21375064541401.

It is not an unprimeable number, because it can be changed into a prime (21375064541449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7916264 + ... + 10267295.

It is an arithmetic number, because the mean of its divisors is an integer number (841989745800).

Almost surely, 2^{21375064541444} is an apocalyptic number.

It is an amenable number.

21375064541444 is a deficient number, since it is larger than the sum of its proper divisors (19040443256956).

21375064541444 is a wasteful number, since it uses less digits than its factorization.

21375064541444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18183932 (or 18183930 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 50.

The spelling of 21375064541444 in words is "twenty-one trillion, three hundred seventy-five billion, sixty-four million, five hundred forty-one thousand, four hundred forty-four".