2121640105331 has 2 divisors, whose sum is σ = 2121640105332. Its totient is φ = 2121640105330.

The previous prime is 2121640105303. The next prime is 2121640105373. The reversal of 2121640105331 is 1335010461212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121640105331 - 2⁶ = 2121640105267 is a prime.

It is a super-2 number, since 2×2121640105331² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2121640105294 and 2121640105303.

It is not a weakly prime, because it can be changed into another prime (2121640105301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060820052665 + 1060820052666.

It is an arithmetic number, because the mean of its divisors is an integer number (1060820052666).

Almost surely, 2^{2121640105331} is an apocalyptic number.

2121640105331 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121640105331 is an equidigital number, since it uses as much as digits as its factorization.

2121640105331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

Adding to 2121640105331 its reverse (1335010461212), we get a palindrome (3456650566543).

The spelling of 2121640105331 in words is "two trillion, one hundred twenty-one billion, six hundred forty million, one hundred five thousand, three hundred thirty-one".