2145220513 has 2 divisors, whose sum is σ = 2145220514. Its totient is φ = 2145220512.

The previous prime is 2145220501. The next prime is 2145220543. The reversal of 2145220513 is 3150225412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1080634129 + 1064586384 = 32873^2 + 32628^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145220513 - 2⁵ = 2145220481 is a prime.

It is not a weakly prime, because it can be changed into another prime (2145220543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072610256 + 1072610257.

It is an arithmetic number, because the mean of its divisors is an integer number (1072610257).

Almost surely, 2^2145220513 is an apocalyptic number.

It is an amenable number.

2145220513 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145220513 is an equidigital number, since it uses as much as digits as its factorization.

2145220513 is an evil number, because the sum of its binary digits is even.

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

The square root of 2145220513 is about 46316.5252690657. The cubic root of 2145220513 is about 1289.7057825097.

Adding to 2145220513 its reverse (3150225412), we get a palindrome (5295445925).

The spelling of 2145220513 in words is "two billion, one hundred forty-five million, two hundred twenty thousand, five hundred thirteen".