2121213101 has 4 divisors (see below), whose sum is σ = 2424243552. Its totient is φ = 1818182652.

The previous prime is 2121213089. The next prime is 2121213113. The reversal of 2121213101 is 1013121212.

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 an interprime number because it is at equal distance from previous prime (2121213089) and next prime (2121213113).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121213101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121213151) 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 3 ways as a sum of consecutive naturals, for example, 151515215 + ... + 151515228.

It is an arithmetic number, because the mean of its divisors is an integer number (606060888).

Almost surely, 2^2121213101 is an apocalyptic number.

It is an amenable number.

2121213101 is a deficient number, since it is larger than the sum of its proper divisors (303030451).

2121213101 is an equidigital number, since it uses as much as digits as its factorization.

2121213101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303030450.

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

The square root of 2121213101 is about 46056.6292839587. The cubic root of 2121213101 is about 1284.8766405423.

Adding to 2121213101 its reverse (1013121212), we get a palindrome (3134334313).

The spelling of 2121213101 in words is "two billion, one hundred twenty-one million, two hundred thirteen thousand, one hundred one".