2120209969 has 2 divisors, whose sum is σ = 2120209970. Its totient is φ = 2120209968.

The previous prime is 2120209921. The next prime is 2120210003. The reversal of 2120209969 is 9699020212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1074528400 + 1045681569 = 32780^2 + 32337^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120209969 - 2¹³ = 2120201777 is a prime.

It is a super-2 number, since 2×2120209969² = 8990580625293961922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2120209369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060104984 + 1060104985.

It is an arithmetic number, because the mean of its divisors is an integer number (1060104985).

Almost surely, 2^2120209969 is an apocalyptic number.

It is an amenable number.

2120209969 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120209969 is an equidigital number, since it uses as much as digits as its factorization.

2120209969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 2120209969 is about 46045.7377940673. The cubic root of 2120209969 is about 1284.6740671339.

The spelling of 2120209969 in words is "two billion, one hundred twenty million, two hundred nine thousand, nine hundred sixty-nine".