2121326520 has 64 divisors (see below), whose sum is σ = 6406179840. Its totient is φ = 561936000.

The previous prime is 2121326507. The next prime is 2121326531. The reversal of 2121326520 is 256231212.

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

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, 40416 + ... + 76655.

It is an arithmetic number, because the mean of its divisors is an integer number (100096560).

Almost surely, 2^2121326520 is an apocalyptic number.

2121326520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121326520 is an abundant number, since it is smaller than the sum of its proper divisors (4284853320).

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

2121326520 is a wasteful number, since it uses less digits than its factorization.

2121326520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117236 (or 117232 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 2121326520 is about 46057.8605669000. The cubic root of 2121326520 is about 1284.8995404616.

Adding to 2121326520 its reverse (256231212), we get a palindrome (2377557732).

The spelling of 2121326520 in words is "two billion, one hundred twenty-one million, three hundred twenty-six thousand, five hundred twenty".