211999969 has 2 divisors, whose sum is σ = 211999970. Its totient is φ = 211999968.

The previous prime is 211999961. The next prime is 212000003. The reversal of 211999969 is 969999112.

211999969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164224225 + 47775744 = 12815^2 + 6912^2 .

It is a cyclic number.

It is not a de Polignac number, because 211999969 - 2³ = 211999961 is a prime.

It is a super-2 number, since 2×211999969² = 89887973712001922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211999961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105999984 + 105999985.

It is an arithmetic number, because the mean of its divisors is an integer number (105999985).

Almost surely, 2^211999969 is an apocalyptic number.

It is an amenable number.

211999969 is a deficient number, since it is larger than the sum of its proper divisors (1).

211999969 is an equidigital number, since it uses as much as digits as its factorization.

211999969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 708588, while the sum is 55.

The square root of 211999969 is about 14560.2187140166. The cubic root of 211999969 is about 596.2731667107.

The spelling of 211999969 in words is "two hundred eleven million, nine hundred ninety-nine thousand, nine hundred sixty-nine".