2121021113 has 4 divisors (see below), whose sum is σ = 2121131520. Its totient is φ = 2120910708.

The previous prime is 2121021103. The next prime is 2121021121. The reversal of 2121021113 is 3111201212.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2121021113 - 2⁸ = 2121020857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121021103) 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, 18053 + ... + 67586.

It is an arithmetic number, because the mean of its divisors is an integer number (530282880).

Almost surely, 2^2121021113 is an apocalyptic number.

It is an amenable number.

2121021113 is a deficient number, since it is larger than the sum of its proper divisors (110407).

2121021113 is an equidigital number, since it uses as much as digits as its factorization.

2121021113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110406.

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

The square root of 2121021113 is about 46054.5449765818. The cubic root of 2121021113 is about 1284.8378752497.

Adding to 2121021113 its reverse (3111201212), we get a palindrome (5232222325).

The spelling of 2121021113 in words is "two billion, one hundred twenty-one million, twenty-one thousand, one hundred thirteen".