2001221201071 has 2 divisors, whose sum is σ = 2001221201072. Its totient is φ = 2001221201070.

The previous prime is 2001221201069. The next prime is 2001221201101. The reversal of 2001221201071 is 1701021221002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2001221201071 - 2¹ = 2001221201069 is a prime.

Together with 2001221201069, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001221201041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000610600535 + 1000610600536.

It is an arithmetic number, because the mean of its divisors is an integer number (1000610600536).

Almost surely, 2^{2001221201071} is an apocalyptic number.

2001221201071 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001221201071 is an equidigital number, since it uses as much as digits as its factorization.

2001221201071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 19.

Adding to 2001221201071 its reverse (1701021221002), we get a palindrome (3702242422073).

The spelling of 2001221201071 in words is "two trillion, one billion, two hundred twenty-one million, two hundred one thousand, seventy-one".