201221101982 has 8 divisors (see below), whose sum is σ = 301858983936. Its totient is φ = 100601440672.

The previous prime is 201221101951. The next prime is 201221102009. The reversal of 201221101982 is 289101122102.

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, 4527518 + ... + 4571745.

It is an arithmetic number, because the mean of its divisors is an integer number (37732372992).

Almost surely, 2^201221101982 is an apocalyptic number.

201221101982 is a deficient number, since it is larger than the sum of its proper divisors (100637881954).

201221101982 is a wasteful number, since it uses less digits than its factorization.

201221101982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9110322.

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

The spelling of 201221101982 in words is "two hundred one billion, two hundred twenty-one million, one hundred one thousand, nine hundred eighty-two".