2121020121331 has 2 divisors, whose sum is σ = 2121020121332. Its totient is φ = 2121020121330.

The previous prime is 2121020121329. The next prime is 2121020121413. The reversal of 2121020121331 is 1331210201212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121020121331 - 2¹ = 2121020121329 is a prime.

It is a super-2 number, since 2×2121020121331² (a number of 25 digits) contains 22 as substring.

Together with 2121020121329, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2121020121299 and 2121020121308.

It is not a weakly prime, because it can be changed into another prime (2121020121431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060510060665 + 1060510060666.

It is an arithmetic number, because the mean of its divisors is an integer number (1060510060666).

Almost surely, 2^{2121020121331} is an apocalyptic number.

2121020121331 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121020121331 is an equidigital number, since it uses as much as digits as its factorization.

2121020121331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 2121020121331 its reverse (1331210201212), we get a palindrome (3452230322543).

The spelling of 2121020121331 in words is "two trillion, one hundred twenty-one billion, twenty million, one hundred twenty-one thousand, three hundred thirty-one".