2001221101982 has 8 divisors (see below), whose sum is σ = 3001837791000. Its totient is φ = 1000608504984.

The previous prime is 2001221101949. The next prime is 2001221101987. The reversal of 2001221101982 is 2891011221002.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001221101987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 998744 + ... + 2236052.

It is an arithmetic number, because the mean of its divisors is an integer number (375229723875).

Almost surely, 2^{2001221101982} is an apocalyptic number.

2001221101982 is a deficient number, since it is larger than the sum of its proper divisors (1000616689018).

2001221101982 is a wasteful number, since it uses less digits than its factorization.

2001221101982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2046010.

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

Adding to 2001221101982 its reverse (2891011221002), we get a palindrome (4892232322984).

The spelling of 2001221101982 in words is "two trillion, one billion, two hundred twenty-one million, one hundred one thousand, nine hundred eighty-two".