2102543450521 has 2 divisors, whose sum is σ = 2102543450522. Its totient is φ = 2102543450520.

The previous prime is 2102543450479. The next prime is 2102543450537. The reversal of 2102543450521 is 1250543452012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2006220120921 + 96323329600 = 1416411^2 + 310360^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102543450521 - 2³¹ = 2100395966873 is a prime.

It is a super-2 number, since 2×2102543450521² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2102543450561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051271725260 + 1051271725261.

It is an arithmetic number, because the mean of its divisors is an integer number (1051271725261).

Almost surely, 2^{2102543450521} is an apocalyptic number.

It is an amenable number.

2102543450521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102543450521 is an equidigital number, since it uses as much as digits as its factorization.

2102543450521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48000, while the sum is 34.

The spelling of 2102543450521 in words is "two trillion, one hundred two billion, five hundred forty-three million, four hundred fifty thousand, five hundred twenty-one".