2001121112101 has 4 divisors (see below), whose sum is σ = 2001215583712. Its totient is φ = 2001026640492.

The previous prime is 2001121112099. The next prime is 2001121112191. The reversal of 2001121112101 is 1012111211002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2001121112101 - 2¹ = 2001121112099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001121112191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47204025 + ... + 47246398.

It is an arithmetic number, because the mean of its divisors is an integer number (500303895928).

Almost surely, 2^{2001121112101} is an apocalyptic number.

It is an amenable number.

2001121112101 is a deficient number, since it is larger than the sum of its proper divisors (94471611).

2001121112101 is an equidigital number, since it uses as much as digits as its factorization.

2001121112101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94471610.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 2001121112101 its reverse (1012111211002), we get a palindrome (3013232323103).

The spelling of 2001121112101 in words is "two trillion, one billion, one hundred twenty-one million, one hundred twelve thousand, one hundred one".