21200133020144 has 80 divisors (see below), whose sum is σ = 45462696867840. Its totient is φ = 9513464463360.

The previous prime is 21200133020113. The next prime is 21200133020153. The reversal of 21200133020144 is 44102033100212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9866129 + ... + 11821199.

It is an arithmetic number, because the mean of its divisors is an integer number (568283710848).

Almost surely, 2^{21200133020144} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21200133020144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22731348433920).

21200133020144 is an abundant number, since it is smaller than the sum of its proper divisors (24262563847696).

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

21200133020144 is a wasteful number, since it uses less digits than its factorization.

21200133020144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1956538 (or 1956532 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21200133020144 its reverse (44102033100212), we get a palindrome (65302166120356).

The spelling of 21200133020144 in words is "twenty-one trillion, two hundred billion, one hundred thirty-three million, twenty thousand, one hundred forty-four".