2105401312321 has 2 divisors, whose sum is σ = 2105401312322. Its totient is φ = 2105401312320.

The previous prime is 2105401312283. The next prime is 2105401312363. The reversal of 2105401312321 is 1232131045012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1448797395600 + 656603916721 = 1203660^2 + 810311^2 .

It is a cyclic number.

It is not a de Polignac number, because 2105401312321 - 2⁷ = 2105401312193 is a prime.

It is not a weakly prime, because it can be changed into another prime (2105401312621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052700656160 + 1052700656161.

It is an arithmetic number, because the mean of its divisors is an integer number (1052700656161).

Almost surely, 2^{2105401312321} is an apocalyptic number.

It is an amenable number.

2105401312321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105401312321 is an equidigital number, since it uses as much as digits as its factorization.

2105401312321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 2105401312321 its reverse (1232131045012), we get a palindrome (3337532357333).

The spelling of 2105401312321 in words is "two trillion, one hundred five billion, four hundred one million, three hundred twelve thousand, three hundred twenty-one".