2120100121 has 4 divisors (see below), whose sum is σ = 2126788452. Its totient is φ = 2113411792.

The previous prime is 2120100109. The next prime is 2120100131. The reversal of 2120100121 is 1210010212.

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 66650896 + 2053449225 = 8164^2 + 45315^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120100121 - 2¹³ = 2120091929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2120100098 and 2120100107.

It is not an unprimeable number, because it can be changed into a prime (2120100131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3343690 + ... + 3344323.

It is an arithmetic number, because the mean of its divisors is an integer number (531697113).

Almost surely, 2^2120100121 is an apocalyptic number.

It is an amenable number.

2120100121 is a deficient number, since it is larger than the sum of its proper divisors (6688331).

2120100121 is an equidigital number, since it uses as much as digits as its factorization.

2120100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6688330.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 2120100121 is about 46044.5449646318. The cubic root of 2120100121 is about 1284.6518804454.

Adding to 2120100121 its reverse (1210010212), we get a palindrome (3330110333).

The spelling of 2120100121 in words is "two billion, one hundred twenty million, one hundred thousand, one hundred twenty-one".