2001122101 has 8 divisors (see below), whose sum is σ = 2193391008. Its totient is φ = 1810578000.

The previous prime is 2001122099. The next prime is 2001122117. The reversal of 2001122101 is 1012211002.

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

It is not a de Polignac number, because 2001122101 - 2¹ = 2001122099 is a prime.

It is a super-2 number, since 2×2001122101² = 8008979326221308402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001122401) 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, 428770 + ... + 433411.

It is an arithmetic number, because the mean of its divisors is an integer number (274173876).

Almost surely, 2^2001122101 is an apocalyptic number.

It is an amenable number.

2001122101 is a deficient number, since it is larger than the sum of its proper divisors (192268907).

2001122101 is a wasteful number, since it uses less digits than its factorization.

2001122101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862403.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 2001122101 is about 44733.9032613967. The cubic root of 2001122101 is about 1260.1566322875.

Adding to 2001122101 its reverse (1012211002), we get a palindrome (3013333103).

The spelling of 2001122101 in words is "two billion, one million, one hundred twenty-two thousand, one hundred one".