2121524520 has 128 divisors (see below), whose sum is σ = 6774451200. Its totient is φ = 529657856.

The previous prime is 2121524519. The next prime is 2121524527. The reversal of 2121524520 is 254251212.

It is a super-2 number, since 2×2121524520² = 9001732577922460800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (2121524527) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 399241 + ... + 404519.

It is an arithmetic number, because the mean of its divisors is an integer number (52925400).

Almost surely, 2^2121524520 is an apocalyptic number.

2121524520 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 2121524520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3387225600).

2121524520 is an abundant number, since it is smaller than the sum of its proper divisors (4652926680).

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

2121524520 is a wasteful number, since it uses less digits than its factorization.

2121524520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5507 (or 5503 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 2121524520 is about 46060.0099869724. The cubic root of 2121524520 is about 1284.9395157933.

Adding to 2121524520 its reverse (254251212), we get a palindrome (2375775732).

The spelling of 2121524520 in words is "two billion, one hundred twenty-one million, five hundred twenty-four thousand, five hundred twenty".