21128367718374 has 24 divisors (see below), whose sum is σ = 49155794284248. Its totient is φ = 6036676490880.

The previous prime is 21128367718373. The next prime is 21128367718379. The reversal of 21128367718374 is 47381776382112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21128367718373) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35932597867 + ... + 35932598454.

It is an arithmetic number, because the mean of its divisors is an integer number (2048158095177).

Almost surely, 2^{21128367718374} is an apocalyptic number.

21128367718374 is an abundant number, since it is smaller than the sum of its proper divisors (28027426565874).

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

21128367718374 is a wasteful number, since it uses less digits than its factorization.

21128367718374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71865196340 (or 71865196333 counting only the distinct ones).

The product of its digits is 18966528, while the sum is 60.

The spelling of 21128367718374 in words is "twenty-one trillion, one hundred twenty-eight billion, three hundred sixty-seven million, seven hundred eighteen thousand, three hundred seventy-four".