2421121121 has 4 divisors (see below), whose sum is σ = 2423138244. Its totient is φ = 2419104000.

The previous prime is 2421121103. The next prime is 2421121127. The reversal of 2421121121 is 1211211242.

2421121121 = T₃₈ + T₃₉ + ... + T₂₄₃₉.

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 238362721 + 2182758400 = 15439^2 + 46720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2421121121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2421121121.

It is not an unprimeable number, because it can be changed into a prime (2421121127) 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, 1006760 + ... + 1009161.

It is an arithmetic number, because the mean of its divisors is an integer number (605784561).

Almost surely, 2^2421121121 is an apocalyptic number.

It is an amenable number.

2421121121 is a deficient number, since it is larger than the sum of its proper divisors (2017123).

2421121121 is a wasteful number, since it uses less digits than its factorization.

2421121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2017122.

The product of its digits is 64, while the sum is 17.

The square root of 2421121121 is about 49204.8891981275. The cubic root of 2421121121 is about 1342.7819831735.

Adding to 2421121121 its reverse (1211211242), we get a palindrome (3632332363).

It can be divided in two parts, 2421121 and 121, that added together give a palindrome (2421242).

The spelling of 2421121121 in words is "two billion, four hundred twenty-one million, one hundred twenty-one thousand, one hundred twenty-one".