2145450521 has 2 divisors, whose sum is σ = 2145450522. Its totient is φ = 2145450520.

The previous prime is 2145450481. The next prime is 2145450529. The reversal of 2145450521 is 1250545412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2024010121 + 121440400 = 44989^2 + 11020^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145450521 - 2¹⁰ = 2145449497 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (2145450529) 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, 1072725260 + 1072725261.

It is an arithmetic number, because the mean of its divisors is an integer number (1072725261).

Almost surely, 2^2145450521 is an apocalyptic number.

It is an amenable number.

2145450521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145450521 is an equidigital number, since it uses as much as digits as its factorization.

2145450521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8000, while the sum is 29.

The square root of 2145450521 is about 46319.0082039760. The cubic root of 2145450521 is about 1289.7518744374.

Adding to 2145450521 its reverse (1250545412), we get a palindrome (3395995933).

The spelling of 2145450521 in words is "two billion, one hundred forty-five million, four hundred fifty thousand, five hundred twenty-one".