2520120321 has 12 divisors (see below), whose sum is σ = 3646716372. Its totient is φ = 1677060576.

The previous prime is 2520120301. The next prime is 2520120367. The reversal of 2520120321 is 1230210252.

2520120321 is a `hidden beast` number, since 2 + 520 + 120 + 3 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1612905921 + 907214400 = 40161^2 + 30120^2 .

It is not a de Polignac number, because 2520120321 - 2⁵ = 2520120289 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2520120294 and 2520120303.

It is not an unprimeable number, because it can be changed into a prime (2520120301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 246346 + ... + 256371.

It is an arithmetic number, because the mean of its divisors is an integer number (303893031).

Almost surely, 2^2520120321 is an apocalyptic number.

It is an amenable number.

2520120321 is a deficient number, since it is larger than the sum of its proper divisors (1126596051).

2520120321 is a wasteful number, since it uses less digits than its factorization.

2520120321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503280 (or 503277 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 2520120321 is about 50200.8000035856. The cubic root of 2520120321 is about 1360.8400809192.

Adding to 2520120321 its reverse (1230210252), we get a palindrome (3750330573).

The spelling of 2520120321 in words is "two billion, five hundred twenty million, one hundred twenty thousand, three hundred twenty-one".