2101320121 has 4 divisors (see below), whose sum is σ = 2101420432. Its totient is φ = 2101219812.

The previous prime is 2101320119. The next prime is 2101320149. The reversal of 2101320121 is 1210231012.

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 2101320121 - 2¹ = 2101320119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101320161) 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, 5451 + ... + 65056.

It is an arithmetic number, because the mean of its divisors is an integer number (525355108).

Almost surely, 2^2101320121 is an apocalyptic number.

It is an amenable number.

2101320121 is a deficient number, since it is larger than the sum of its proper divisors (100311).

2101320121 is an equidigital number, since it uses as much as digits as its factorization.

2101320121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100310.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2101320121 is about 45840.1583875972. The cubic root of 2101320121 is about 1280.8474451994.

Adding to 2101320121 its reverse (1210231012), we get a palindrome (3311551133).

The spelling of 2101320121 in words is "two billion, one hundred one million, three hundred twenty thousand, one hundred twenty-one".