2001221201983 has 2 divisors, whose sum is σ = 2001221201984. Its totient is φ = 2001221201982.

The previous prime is 2001221201849. The next prime is 2001221202031. The reversal of 2001221201983 is 3891021221002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2001221201983 - 2³³ = 1992631267391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001221201783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000610600991 + 1000610600992.

It is an arithmetic number, because the mean of its divisors is an integer number (1000610600992).

Almost surely, 2^{2001221201983} is an apocalyptic number.

2001221201983 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001221201983 is an equidigital number, since it uses as much as digits as its factorization.

2001221201983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

Adding to 2001221201983 its reverse (3891021221002), we get a palindrome (5892242422985).

The spelling of 2001221201983 in words is "two trillion, one billion, two hundred twenty-one million, two hundred one thousand, nine hundred eighty-three".