2121200021982 has 16 divisors (see below), whose sum is σ = 4345873216272. Its totient is φ = 689821145280.

The previous prime is 2121200021981. The next prime is 2121200021989. The reversal of 2121200021982 is 2891200021212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121200021981) 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, 4311381913 + ... + 4311382404.

It is an arithmetic number, because the mean of its divisors is an integer number (271617076017).

Almost surely, 2^{2121200021982} is an apocalyptic number.

2121200021982 is an abundant number, since it is smaller than the sum of its proper divisors (2224673194290).

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

2121200021982 is a wasteful number, since it uses less digits than its factorization.

2121200021982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8622764363.

The product of its (nonzero) digits is 2304, while the sum is 30.

The spelling of 2121200021982 in words is "two trillion, one hundred twenty-one billion, two hundred million, twenty-one thousand, nine hundred eighty-two".