2520021506 has 4 divisors (see below), whose sum is σ = 3780032262. Its totient is φ = 1260010752.

The previous prime is 2520021479. The next prime is 2520021529. The reversal of 2520021506 is 6051200252.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2439470881 + 80550625 = 49391^2 + 8975^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630005375 + ... + 630005378.

Almost surely, 2^2520021506 is an apocalyptic number.

2520021506 is a deficient number, since it is larger than the sum of its proper divisors (1260010756).

2520021506 is a wasteful number, since it uses less digits than its factorization.

2520021506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260010755.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 2520021506 is about 50199.8157964748. The cubic root of 2520021506 is about 1360.8222943121.

Adding to 2520021506 its reverse (6051200252), we get a palindrome (8571221758).

The spelling of 2520021506 in words is "two billion, five hundred twenty million, twenty-one thousand, five hundred six".