2145202434521 has 2 divisors, whose sum is σ = 2145202434522. Its totient is φ = 2145202434520.

The previous prime is 2145202434511. The next prime is 2145202434581. The reversal of 2145202434521 is 1254342025412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1847098446400 + 298103988121 = 1359080^2 + 545989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2145202434521 is a prime.

It is not a weakly prime, because it can be changed into another prime (2145202434511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072601217260 + 1072601217261.

It is an arithmetic number, because the mean of its divisors is an integer number (1072601217261).

Almost surely, 2^{2145202434521} is an apocalyptic number.

It is an amenable number.

2145202434521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145202434521 is an equidigital number, since it uses as much as digits as its factorization.

2145202434521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76800, while the sum is 35.

Adding to 2145202434521 its reverse (1254342025412), we get a palindrome (3399544459933).

The spelling of 2145202434521 in words is "two trillion, one hundred forty-five billion, two hundred two million, four hundred thirty-four thousand, five hundred twenty-one".