2120920909 has 2 divisors, whose sum is σ = 2120920910. Its totient is φ = 2120920908.

The previous prime is 2120920897. The next prime is 2120920913. The reversal of 2120920909 is 9090290212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1434742884 + 686178025 = 37878^2 + 26195^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120920909 - 2⁵ = 2120920877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120920609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060460454 + 1060460455.

It is an arithmetic number, because the mean of its divisors is an integer number (1060460455).

Almost surely, 2^2120920909 is an apocalyptic number.

It is an amenable number.

2120920909 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120920909 is an equidigital number, since it uses as much as digits as its factorization.

2120920909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 2120920909 is about 46053.4570797894. The cubic root of 2120920909 is about 1284.8176416115.

The spelling of 2120920909 in words is "two billion, one hundred twenty million, nine hundred twenty thousand, nine hundred nine".