2001121022121 has 32 divisors (see below), whose sum is σ = 3024762007680. Its totient is φ = 1166596992000.

The previous prime is 2001121022111. The next prime is 2001121022183. The reversal of 2001121022121 is 1212201211002.

It is not a de Polignac number, because 2001121022121 - 2⁶ = 2001121022057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2001121022121.

It is not an unprimeable number, because it can be changed into a prime (2001121022111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25882321 + ... + 25959521.

It is an arithmetic number, because the mean of its divisors is an integer number (94523812740).

Almost surely, 2^{2001121022121} is an apocalyptic number.

It is an amenable number.

2001121022121 is a deficient number, since it is larger than the sum of its proper divisors (1023640985559).

2001121022121 is a wasteful number, since it uses less digits than its factorization.

2001121022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112217.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2001121022121 its reverse (1212201211002), we get a palindrome (3213322233123).

The spelling of 2001121022121 in words is "two trillion, one billion, one hundred twenty-one million, twenty-two thousand, one hundred twenty-one".