211129999 has 2 divisors, whose sum is σ = 211130000. Its totient is φ = 211129998.

The previous prime is 211129981. The next prime is 211130009. The reversal of 211129999 is 999921112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211129999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211120999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105564999 + 105565000.

It is an arithmetic number, because the mean of its divisors is an integer number (105565000).

Almost surely, 2^211129999 is an apocalyptic number.

211129999 is a deficient number, since it is larger than the sum of its proper divisors (1).

211129999 is an equidigital number, since it uses as much as digits as its factorization.

211129999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 43.

The square root of 211129999 is about 14530.3131074316. The cubic root of 211129999 is about 595.4564197966.

The spelling of 211129999 in words is "two hundred eleven million, one hundred twenty-nine thousand, nine hundred ninety-nine".