212209969 has 2 divisors, whose sum is σ = 212209970. Its totient is φ = 212209968.

The previous prime is 212209967. The next prime is 212210021. The reversal of 212209969 is 969902212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129618225 + 82591744 = 11385^2 + 9088^2 .

It is a cyclic number.

It is not a de Polignac number, because 212209969 - 2¹ = 212209967 is a prime.

It is a super-2 number, since 2×212209969² = 90066141885961922, which contains 22 as substring.

Together with 212209967, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (212209967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106104984 + 106104985.

It is an arithmetic number, because the mean of its divisors is an integer number (106104985).

Almost surely, 2^212209969 is an apocalyptic number.

It is an amenable number.

212209969 is a deficient number, since it is larger than the sum of its proper divisors (1).

212209969 is an equidigital number, since it uses as much as digits as its factorization.

212209969 is an odious number, because the sum of its binary digits is odd.

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

The square root of 212209969 is about 14567.4283591854. The cubic root of 212209969 is about 596.4699844162.

The spelling of 212209969 in words is "two hundred twelve million, two hundred nine thousand, nine hundred sixty-nine".