2123124240 has 80 divisors (see below), whose sum is σ = 6598559808. Its totient is φ = 564715008.

The previous prime is 2123124217. The next prime is 2123124247. The reversal of 2123124240 is 424213212.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (2123124247) 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, 84139 + ... + 106421.

Almost surely, 2^2123124240 is an apocalyptic number.

2123124240 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 2123124240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3299279904).

2123124240 is an abundant number, since it is smaller than the sum of its proper divisors (4475435568).

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

2123124240 is a wasteful number, since it uses less digits than its factorization.

2123124240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22696 (or 22690 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 2123124240 is about 46077.3723209126. The cubic root of 2123124240 is about 1285.2624010555.

Adding to 2123124240 its reverse (424213212), we get a palindrome (2547337452).

The spelling of 2123124240 in words is "two billion, one hundred twenty-three million, one hundred twenty-four thousand, two hundred forty".