2121030121 has 12 divisors (see below), whose sum is σ = 2469467088. Its totient is φ = 1816444392.

The previous prime is 2121030089. The next prime is 2121030133. The reversal of 2121030121 is 1210301212.

It is not a de Polignac number, because 2121030121 - 2⁵ = 2121030089 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121030181) 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 11 ways as a sum of consecutive naturals, for example, 39930 + ... + 76396.

It is an arithmetic number, because the mean of its divisors is an integer number (205788924).

Almost surely, 2^2121030121 is an apocalyptic number.

It is an amenable number.

2121030121 is a deficient number, since it is larger than the sum of its proper divisors (348436967).

2121030121 is a wasteful number, since it uses less digits than its factorization.

2121030121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37668 (or 37661 counting only the distinct ones).

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

The square root of 2121030121 is about 46054.6427735576. The cubic root of 2121030121 is about 1284.8396941540.

Adding to 2121030121 its reverse (1210301212), we get a palindrome (3331331333).

It can be divided in two parts, 2 and 121030121, that multiplied together give a palindrome (242060242).

The spelling of 2121030121 in words is "two billion, one hundred twenty-one million, thirty thousand, one hundred twenty-one".