2520202021 has 8 divisors (see below), whose sum is σ = 2532860280. Its totient is φ = 2507558592.

The previous prime is 2520202019. The next prime is 2520202057. The reversal of 2520202021 is 1202020252.

It can be written as a sum of positive squares in 4 ways, for example, as 1957089121 + 563112900 = 44239^2 + 23730^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2520202021 - 2¹ = 2520202019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2520201986 and 2520202004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2520202001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 504291 + ... + 509263.

It is an arithmetic number, because the mean of its divisors is an integer number (316607535).

Almost surely, 2^2520202021 is an apocalyptic number.

It is an amenable number.

2520202021 is a deficient number, since it is larger than the sum of its proper divisors (12658259).

2520202021 is a wasteful number, since it uses less digits than its factorization.

2520202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7415.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 2520202021 is about 50201.6137290426. The cubic root of 2520202021 is about 1360.8547864913.

Adding to 2520202021 its reverse (1202020252), we get a palindrome (3722222273).

The spelling of 2520202021 in words is "two billion, five hundred twenty million, two hundred two thousand, twenty-one".