2121199955684 has 24 divisors (see below), whose sum is σ = 3823413861120. Its totient is φ = 1028961212256.

The previous prime is 2121199955683. The next prime is 2121199955687. The reversal of 2121199955684 is 4865599911212.

It is not an unprimeable number, because it can be changed into a prime (2121199955683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20600564 + ... + 20703275.

It is an arithmetic number, because the mean of its divisors is an integer number (159308910880).

Almost surely, 2^{2121199955684} is an apocalyptic number.

It is an amenable number.

2121199955684 is a deficient number, since it is larger than the sum of its proper divisors (1702213905436).

2121199955684 is a wasteful number, since it uses less digits than its factorization.

2121199955684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41304227 (or 41304225 counting only the distinct ones).

The product of its digits is 13996800, while the sum is 62.

The spelling of 2121199955684 in words is "two trillion, one hundred twenty-one billion, one hundred ninety-nine million, nine hundred fifty-five thousand, six hundred eighty-four".