2121001101 has 48 divisors (see below), whose sum is σ = 3312840960. Its totient is φ = 1304795520.

The previous prime is 2121001087. The next prime is 2121001163. The reversal of 2121001101 is 1011001212.

It is a happy number.

It is not a de Polignac number, because 2121001101 - 2¹¹ = 2120999053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121001301) 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 47 ways as a sum of consecutive naturals, for example, 525471 + ... + 529491.

It is an arithmetic number, because the mean of its divisors is an integer number (69017520).

Almost surely, 2^2121001101 is an apocalyptic number.

It is an amenable number.

2121001101 is a deficient number, since it is larger than the sum of its proper divisors (1191839859).

2121001101 is a wasteful number, since it uses less digits than its factorization.

2121001101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4146 (or 4143 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 2121001101 is about 46054.3277119534. The cubic root of 2121001101 is about 1284.8338343884.

Adding to 2121001101 its reverse (1011001212), we get a palindrome (3132002313).

The spelling of 2121001101 in words is "two billion, one hundred twenty-one million, one thousand, one hundred one".