2001122122121 has 8 divisors (see below), whose sum is σ = 2001673131264. Its totient is φ = 2000571204240.

The previous prime is 2001122122099. The next prime is 2001122122159. The reversal of 2001122122121 is 1212212211002.

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

It is a cyclic number.

It is not a de Polignac number, because 2001122122121 - 2¹⁴ = 2001122105737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2001122122121.

It is not an unprimeable number, because it can be changed into a prime (2001122122721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68935016 + ... + 68964038.

It is an arithmetic number, because the mean of its divisors is an integer number (250209141408).

Almost surely, 2^{2001122122121} is an apocalyptic number.

It is an amenable number.

2001122122121 is a deficient number, since it is larger than the sum of its proper divisors (551009143).

2001122122121 is an equidigital number, since it uses as much as digits as its factorization.

2001122122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45631.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2001122122121 its reverse (1212212211002), we get a palindrome (3213334333123).

The spelling of 2001122122121 in words is "two trillion, one billion, one hundred twenty-two million, one hundred twenty-two thousand, one hundred twenty-one".