2131220100 has 72 divisors (see below), whose sum is σ = 6282722880. Its totient is φ = 557598080.

The previous prime is 2131220083. The next prime is 2131220131. The reversal of 2131220100 is 10221312.

It is a super-2 number, since 2×2131220100² = 9084198229288020000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51120 + ... + 82919.

It is an arithmetic number, because the mean of its divisors is an integer number (87260040).

Almost surely, 2^2131220100 is an apocalyptic number.

2131220100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2131220100 is an abundant number, since it is smaller than the sum of its proper divisors (4151502780).

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

2131220100 is a wasteful number, since it uses less digits than its factorization.

2131220100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134109 (or 134102 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 2131220100 is about 46165.1394452567. The cubic root of 2131220100 is about 1286.8939756377.

Adding to 2131220100 its reverse (10221312), we get a palindrome (2141441412).

The spelling of 2131220100 in words is "two billion, one hundred thirty-one million, two hundred twenty thousand, one hundred".