2221131500 has 48 divisors (see below), whose sum is σ = 5543952960. Its totient is φ = 761529600.

The previous prime is 2221131467. The next prime is 2221131509. The reversal of 2221131500 is 51311222.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2221131509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 313805 + ... + 320804.

It is an arithmetic number, because the mean of its divisors is an integer number (115499020).

Almost surely, 2^2221131500 is an apocalyptic number.

2221131500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2221131500 is an abundant number, since it is smaller than the sum of its proper divisors (3322821460).

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

2221131500 is a wasteful number, since it uses less digits than its factorization.

2221131500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634635 (or 634623 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 2221131500 is about 47128.8818029879. The cubic root of 2221131500 is about 1304.7423437928.

Adding to 2221131500 its reverse (51311222), we get a palindrome (2272442722).

The spelling of 2221131500 in words is "two billion, two hundred twenty-one million, one hundred thirty-one thousand, five hundred".