2251721100 has 36 divisors (see below), whose sum is σ = 6514980584. Its totient is φ = 600458880.

The previous prime is 2251721083. The next prime is 2251721119. The reversal of 2251721100 is 11271522.

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 in 11 ways as a sum of consecutive naturals, for example, 3752569 + ... + 3753168.

Almost surely, 2^2251721100 is an apocalyptic number.

2251721100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2251721100 is an abundant number, since it is smaller than the sum of its proper divisors (4263259484).

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

2251721100 is a wasteful number, since it uses less digits than its factorization.

2251721100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7505754 (or 7505747 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 2251721100 is about 47452.3034214357. The cubic root of 2251721100 is about 1310.7047273570.

Adding to 2251721100 its reverse (11271522), we get a palindrome (2262992622).

The spelling of 2251721100 in words is "two billion, two hundred fifty-one million, seven hundred twenty-one thousand, one hundred".