21745753755198 has 128 divisors (see below), whose sum is σ = 48579920363520. Its totient is φ = 6434064299520.

The previous prime is 21745753755181. The next prime is 21745753755227. The reversal of 21745753755198 is 89155735754712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 390401686 + ... + 390457382.

It is an arithmetic number, because the mean of its divisors is an integer number (379530627840).

Almost surely, 2^{21745753755198} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21745753755198, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24289960181760).

21745753755198 is an abundant number, since it is smaller than the sum of its proper divisors (26834166608322).

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

21745753755198 is a wasteful number, since it uses less digits than its factorization.

21745753755198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56622.

The product of its digits is 370440000, while the sum is 69.

The spelling of 21745753755198 in words is "twenty-one trillion, seven hundred forty-five billion, seven hundred fifty-three million, seven hundred fifty-five thousand, one hundred ninety-eight".