2121321101 has 4 divisors (see below), whose sum is σ = 2232969600. Its totient is φ = 2009672604.

The previous prime is 2121321091. The next prime is 2121321113. The reversal of 2121321101 is 1011231212.

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 2121321101 - 2¹⁰ = 2121320077 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 (2121321151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55824221 + ... + 55824258.

It is an arithmetic number, because the mean of its divisors is an integer number (558242400).

Almost surely, 2^2121321101 is an apocalyptic number.

It is an amenable number.

2121321101 is a deficient number, since it is larger than the sum of its proper divisors (111648499).

2121321101 is a wasteful number, since it uses less digits than its factorization.

2121321101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111648498.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 2121321101 is about 46057.8017386848. The cubic root of 2121321101 is about 1284.8984463542.

Adding to 2121321101 its reverse (1011231212), we get a palindrome (3132552313).

The spelling of 2121321101 in words is "two billion, one hundred twenty-one million, three hundred twenty-one thousand, one hundred one".