2120066521 has 2 divisors, whose sum is σ = 2120066522. Its totient is φ = 2120066520.

The previous prime is 2120066477. The next prime is 2120066527. The reversal of 2120066521 is 1256600212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1219406400 + 900660121 = 34920^2 + 30011^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120066521 - 2¹³ = 2120058329 is a prime.

It is not a weakly prime, because it can be changed into another prime (2120066527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060033260 + 1060033261.

It is an arithmetic number, because the mean of its divisors is an integer number (1060033261).

Almost surely, 2^2120066521 is an apocalyptic number.

It is an amenable number.

2120066521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120066521 is an equidigital number, since it uses as much as digits as its factorization.

2120066521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2120066521 is about 46044.1800991178. The cubic root of 2120066521 is about 1284.6450938899.

Adding to 2120066521 its reverse (1256600212), we get a palindrome (3376666733).

The spelling of 2120066521 in words is "two billion, one hundred twenty million, sixty-six thousand, five hundred twenty-one".