2101213121 has 8 divisors (see below), whose sum is σ = 2435209344. Its totient is φ = 1775672640.

The previous prime is 2101213109. The next prime is 2101213123. The reversal of 2101213121 is 1213121012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2101213121 - 2⁶ = 2101213057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101213096 and 2101213105.

It is not an unprimeable number, because it can be changed into a prime (2101213123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2113400 + ... + 2114393.

It is an arithmetic number, because the mean of its divisors is an integer number (304401168).

Almost surely, 2^2101213121 is an apocalyptic number.

It is an amenable number.

2101213121 is a deficient number, since it is larger than the sum of its proper divisors (333996223).

2101213121 is an equidigital number, since it uses as much as digits as its factorization.

2101213121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4227871.

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

The square root of 2101213121 is about 45838.9912738053. The cubic root of 2101213121 is about 1280.8257044214.

Adding to 2101213121 its reverse (1213121012), we get a palindrome (3314334133).

The spelling of 2101213121 in words is "two billion, one hundred one million, two hundred thirteen thousand, one hundred twenty-one".