20121121982 has 8 divisors (see below), whose sum is σ = 32503350936. Its totient is φ = 9286671672.

The previous prime is 20121121949. The next prime is 20121121991. The reversal of 20121121982 is 28912112102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386944628 + ... + 386944679.

It is an arithmetic number, because the mean of its divisors is an integer number (4062918867).

Almost surely, 2^20121121982 is an apocalyptic number.

20121121982 is a deficient number, since it is larger than the sum of its proper divisors (12382228954).

20121121982 is a wasteful number, since it uses less digits than its factorization.

20121121982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773889322.

The product of its (nonzero) digits is 1152, while the sum is 29.

The spelling of 20121121982 in words is "twenty billion, one hundred twenty-one million, one hundred twenty-one thousand, nine hundred eighty-two".