2121149969 has 2 divisors, whose sum is σ = 2121149970. Its totient is φ = 2121149968.

The previous prime is 2121149957. The next prime is 2121150029. The reversal of 2121149969 is 9699411212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2118300625 + 2849344 = 46025^2 + 1688^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121149969 is a prime.

It is a super-2 number, since 2×2121149969² = 8998554381977401922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2121149939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060574984 + 1060574985.

It is an arithmetic number, because the mean of its divisors is an integer number (1060574985).

Almost surely, 2^2121149969 is an apocalyptic number.

It is an amenable number.

2121149969 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121149969 is an equidigital number, since it uses as much as digits as its factorization.

2121149969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 44.

The square root of 2121149969 is about 46055.9439052116. The cubic root of 2121149969 is about 1284.8638934909.

The spelling of 2121149969 in words is "two billion, one hundred twenty-one million, one hundred forty-nine thousand, nine hundred sixty-nine".