21000120999974 has 32 divisors (see below), whose sum is σ = 31748550462720. Its totient is φ = 10417605117952.

The previous prime is 21000120999973. The next prime is 21000121000031. The reversal of 21000120999974 is 47999902100012.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000120999973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1411385867 + ... + 1411400745.

It is an arithmetic number, because the mean of its divisors is an integer number (992142201960).

Almost surely, 2^{21000120999974} is an apocalyptic number.

21000120999974 is a deficient number, since it is larger than the sum of its proper divisors (10748429462746).

21000120999974 is a wasteful number, since it uses less digits than its factorization.

21000120999974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25744.

The product of its (nonzero) digits is 734832, while the sum is 53.

The spelling of 21000120999974 in words is "twenty-one trillion, one hundred twenty million, nine hundred ninety-nine thousand, nine hundred seventy-four".