2121240121 has 16 divisors (see below), whose sum is σ = 2848099968. Its totient is φ = 1525766400.

The previous prime is 2121240103. The next prime is 2121240133. The reversal of 2121240121 is 1210421212.

It is a cyclic number.

It is not a de Polignac number, because 2121240121 - 2⁷ = 2121239993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121240095 and 2121240104.

It is not an unprimeable number, because it can be changed into a prime (2121240101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1058560 + ... + 1060561.

It is an arithmetic number, because the mean of its divisors is an integer number (178006248).

Almost surely, 2^2121240121 is an apocalyptic number.

It is an amenable number.

2121240121 is a deficient number, since it is larger than the sum of its proper divisors (726859847).

2121240121 is a wasteful number, since it uses less digits than its factorization.

2121240121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2119152.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 2121240121 is about 46056.9226175610. The cubic root of 2121240121 is about 1284.8820961028.

Adding to 2121240121 its reverse (1210421212), we get a palindrome (3331661333).

It can be divided in two parts, 2121 and 240121, that added together give a palindrome (242242).

The spelling of 2121240121 in words is "two billion, one hundred twenty-one million, two hundred forty thousand, one hundred twenty-one".