211219969 has 2 divisors, whose sum is σ = 211219970. Its totient is φ = 211219968.

The previous prime is 211219961. The next prime is 211219973. The reversal of 211219969 is 969912112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 174556944 + 36663025 = 13212^2 + 6055^2 .

It is a cyclic number.

It is not a de Polignac number, because 211219969 - 2³ = 211219961 is a prime.

It is a super-2 number, since 2×211219969² = 89227750608721922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211219961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105609984 + 105609985.

It is an arithmetic number, because the mean of its divisors is an integer number (105609985).

Almost surely, 2^211219969 is an apocalyptic number.

It is an amenable number.

211219969 is a deficient number, since it is larger than the sum of its proper divisors (1).

211219969 is an equidigital number, since it uses as much as digits as its factorization.

211219969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 40.

The square root of 211219969 is about 14533.4087192234. The cubic root of 211219969 is about 595.5409895030.

The spelling of 211219969 in words is "two hundred eleven million, two hundred nineteen thousand, nine hundred sixty-nine".