2123513440 has 96 divisors (see below), whose sum is σ = 5137945344. Its totient is φ = 829140480.

The previous prime is 2123513411. The next prime is 2123513449. The reversal of 2123513440 is 443153212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123513449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1214647 + ... + 1216393.

It is an arithmetic number, because the mean of its divisors is an integer number (53520264).

Almost surely, 2^2123513440 is an apocalyptic number.

2123513440 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 2123513440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2568972672).

2123513440 is an abundant number, since it is smaller than the sum of its proper divisors (3014431904).

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

2123513440 is a wasteful number, since it uses less digits than its factorization.

2123513440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940 (or 1932 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 2123513440 is about 46081.5954584908. The cubic root of 2123513440 is about 1285.3409321111.

Adding to 2123513440 its reverse (443153212), we get a palindrome (2566666652).

The spelling of 2123513440 in words is "two billion, one hundred twenty-three million, five hundred thirteen thousand, four hundred forty".