2005342100521 has 2 divisors, whose sum is σ = 2005342100522. Its totient is φ = 2005342100520.

The previous prime is 2005342100483. The next prime is 2005342100533. The reversal of 2005342100521 is 1250012435002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1695829017600 + 309513082921 = 1302240^2 + 556339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2005342100521 is a prime.

It is not a weakly prime, because it can be changed into another prime (2005342109521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1002671050260 + 1002671050261.

It is an arithmetic number, because the mean of its divisors is an integer number (1002671050261).

Almost surely, 2^{2005342100521} is an apocalyptic number.

It is an amenable number.

2005342100521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2005342100521 is an equidigital number, since it uses as much as digits as its factorization.

2005342100521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 2005342100521 its reverse (1250012435002), we get a palindrome (3255354535523).

The spelling of 2005342100521 in words is "two trillion, five billion, three hundred forty-two million, one hundred thousand, five hundred twenty-one".