2120111001 has 24 divisors (see below), whose sum is σ = 3140417280.
Its totient is φ = 1377534816.
The previous prime is 2120110973. The next prime is 2120111011. The reversal of 2120111001 is 1001110212.
Adding to 2120111001 its reverse (1001110212), we get a palindrome (3121221213).
It is a happy number.
It is not a de Polignac number, because 2120111001 - 25 = 2120110969 is a prime.
It is a super-2 number, since 2×21201110012 = 8989741313122444002, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (9).
It is not an unprimeable number, because it can be changed into a prime (2120111011) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 179655 + ... + 191091.
It is an arithmetic number, because the mean of its divisors is an integer number (130850720).
Almost surely, 22120111001 is an apocalyptic number.
It is an amenable number.
2120111001 is a deficient number, since it is larger than the sum of its proper divisors (1020306279).
2120111001 is a wasteful number, since it uses less digits than its factorization.
2120111001 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 11965 (or 11962 counting only the distinct ones).
The product of its (nonzero) digits is 4, while the sum is 9.
The square root of 2120111001 is about 46044.6631109404.
The cubic root of 2120111001 is about 1284.6540779813.
The spelling of 2120111001 in words is "two billion, one hundred twenty million, one hundred eleven thousand, one".