2001012102121 has 2 divisors, whose sum is σ = 2001012102122. Its totient is φ = 2001012102120.

The previous prime is 2001012102107. The next prime is 2001012102211. The reversal of 2001012102121 is 1212012101002.

Together with next prime (2001012102211) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1815392443225 + 185619658896 = 1347365^2 + 430836^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001012102121 - 2³³ = 1992422167529 is a prime.

It is not a weakly prime, because it can be changed into another prime (2001012102821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000506051060 + 1000506051061.

It is an arithmetic number, because the mean of its divisors is an integer number (1000506051061).

Almost surely, 2^{2001012102121} is an apocalyptic number.

It is an amenable number.

2001012102121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001012102121 is an equidigital number, since it uses as much as digits as its factorization.

2001012102121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2001012102121 its reverse (1212012101002), we get a palindrome (3213024203123).

The spelling of 2001012102121 in words is "two trillion, one billion, twelve million, one hundred two thousand, one hundred twenty-one".