2131221300 has 72 divisors (see below), whose sum is σ = 6640679136. Its totient is φ = 524607360.

The previous prime is 2131221283. The next prime is 2131221359. The reversal of 2131221300 is 31221312.

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 2131221300.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 269334 + ... + 277133.

Almost surely, 2^2131221300 is an apocalyptic number.

2131221300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2131221300 is an abundant number, since it is smaller than the sum of its proper divisors (4509457836).

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

2131221300 is a wasteful number, since it uses less digits than its factorization.

2131221300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546497 (or 546490 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 2131221300 is about 46165.1524420747. The cubic root of 2131221300 is about 1286.8942171695.

Adding to 2131221300 its reverse (31221312), we get a palindrome (2162442612).

The spelling of 2131221300 in words is "two billion, one hundred thirty-one million, two hundred twenty-one thousand, three hundred".