2521220100 has 72 divisors (see below), whose sum is σ = 8336841408. Its totient is φ = 576278400.

The previous prime is 2521220089. The next prime is 2521220113. The reversal of 2521220100 is 10221252.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2521220100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 598191 + ... + 602390.

It is an arithmetic number, because the mean of its divisors is an integer number (115789464).

Almost surely, 2^2521220100 is an apocalyptic number.

2521220100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2521220100 is an abundant number, since it is smaller than the sum of its proper divisors (5815621308).

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

2521220100 is a wasteful number, since it uses less digits than its factorization.

2521220100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200605 (or 1200598 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 2521220100 is about 50211.7526083287. The cubic root of 2521220100 is about 1361.0380087291.

Adding to 2521220100 its reverse (10221252), we get a palindrome (2531441352).

The spelling of 2521220100 in words is "two billion, five hundred twenty-one million, two hundred twenty thousand, one hundred".