2521785220 has 12 divisors (see below), whose sum is σ = 5295749004. Its totient is φ = 1008714080.

The previous prime is 2521785197. The next prime is 2521785223. The reversal of 2521785220 is 225871252.

It can be written as a sum of positive squares in 2 ways, for example, as 1552832836 + 968952384 = 39406^2 + 31128^2 .

It is not an unprimeable number, because it can be changed into a prime (2521785223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63044611 + ... + 63044650.

It is an arithmetic number, because the mean of its divisors is an integer number (441312417).

Almost surely, 2^2521785220 is an apocalyptic number.

2521785220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2521785220 is an abundant number, since it is smaller than the sum of its proper divisors (2773963784).

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

2521785220 is a wasteful number, since it uses less digits than its factorization.

2521785220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126089270 (or 126089268 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 2521785220 is about 50217.3796608306. The cubic root of 2521785220 is about 1361.1396912888.

The spelling of 2521785220 in words is "two billion, five hundred twenty-one million, seven hundred eighty-five thousand, two hundred twenty".