2120543440000 has 160 divisors (see below), whose sum is σ = 5284781063100. Its totient is φ = 847282176000.

The previous prime is 2120543439997. The next prime is 2120543440019. The reversal of 2120543440000 is 443450212.

It is a happy number.

It can be written as a sum of positive squares in 10 ways, for example, as 170185951296 + 1950357488704 = 412536^2 + 1396552^2 .

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 74945856 + ... + 74974144.

Almost surely, 2^{2120543440000} is an apocalyptic number.

2120543440000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2120543440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2642390531550).

2120543440000 is an abundant number, since it is smaller than the sum of its proper divisors (3164237623100).

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

2120543440000 is an frugal number, since it uses more digits than its factorization.

2120543440000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29260 (or 29233 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 2120543440000 its reverse (443450212), we get a palindrome (2120986890212).

The spelling of 2120543440000 in words is "two trillion, one hundred twenty billion, five hundred forty-three million, four hundred forty thousand".