2121243101 has 4 divisors (see below), whose sum is σ = 2123123100. Its totient is φ = 2119363104.

The previous prime is 2121243071. The next prime is 2121243127. The reversal of 2121243101 is 1013421212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 546343876 + 1574899225 = 23374^2 + 39685^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121243101 - 2¹⁸ = 2120980957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121243101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121243161) 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, 938306 + ... + 940563.

It is an arithmetic number, because the mean of its divisors is an integer number (530780775).

Almost surely, 2^2121243101 is an apocalyptic number.

It is an amenable number.

2121243101 is a deficient number, since it is larger than the sum of its proper divisors (1879999).

2121243101 is a wasteful number, since it uses less digits than its factorization.

2121243101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1879998.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 2121243101 is about 46056.9549688209. The cubic root of 2121243101 is about 1284.8826977865.

Adding to 2121243101 its reverse (1013421212), we get a palindrome (3134664313).

The spelling of 2121243101 in words is "two billion, one hundred twenty-one million, two hundred forty-three thousand, one hundred one".