2120217925897 has 2 divisors, whose sum is σ = 2120217925898. Its totient is φ = 2120217925896.

The previous prime is 2120217925873. The next prime is 2120217925913. The reversal of 2120217925897 is 7985297120212.

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., 2086765150096 + 33452775801 = 1444564^2 + 182901^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2120217925897 is a prime.

It is not a weakly prime, because it can be changed into another prime (2120217922897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060108962948 + 1060108962949.

It is an arithmetic number, because the mean of its divisors is an integer number (1060108962949).

Almost surely, 2^{2120217925897} is an apocalyptic number.

It is an amenable number.

2120217925897 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120217925897 is an equidigital number, since it uses as much as digits as its factorization.

2120217925897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2540160, while the sum is 55.

The spelling of 2120217925897 in words is "two trillion, one hundred twenty billion, two hundred seventeen million, nine hundred twenty-five thousand, eight hundred ninety-seven".