2121121441 has 2 divisors, whose sum is σ = 2121121442. Its totient is φ = 2121121440.

The previous prime is 2121121439. The next prime is 2121121489. The reversal of 2121121441 is 1441211212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1842899041 + 278222400 = 42929^2 + 16680^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121121441 - 2¹ = 2121121439 is a prime.

Together with 2121121439, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2121121141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060560720 + 1060560721.

It is an arithmetic number, because the mean of its divisors is an integer number (1060560721).

Almost surely, 2^2121121441 is an apocalyptic number.

It is an amenable number.

2121121441 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121121441 is an equidigital number, since it uses as much as digits as its factorization.

2121121441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 128, while the sum is 19.

The square root of 2121121441 is about 46055.6341938747. The cubic root of 2121121441 is about 1284.8581332882.

Adding to 2121121441 its reverse (1441211212), we get a palindrome (3562332653).

The spelling of 2121121441 in words is "two billion, one hundred twenty-one million, one hundred twenty-one thousand, four hundred forty-one".