2121640105373 has 2 divisors, whose sum is σ = 2121640105374. Its totient is φ = 2121640105372.

The previous prime is 2121640105331. The next prime is 2121640105393. The reversal of 2121640105373 is 3735010461212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1142446735609 + 979193369764 = 1068853^2 + 989542^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121640105373 - 2¹⁸ = 2121639843229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121640105303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060820052686 + 1060820052687.

It is an arithmetic number, because the mean of its divisors is an integer number (1060820052687).

Almost surely, 2^{2121640105373} is an apocalyptic number.

It is an amenable number.

2121640105373 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121640105373 is an equidigital number, since it uses as much as digits as its factorization.

2121640105373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 35.

Adding to 2121640105373 its reverse (3735010461212), we get a palindrome (5856650566585).

The spelling of 2121640105373 in words is "two trillion, one hundred twenty-one billion, six hundred forty million, one hundred five thousand, three hundred seventy-three".