211979429 has 2 divisors, whose sum is σ = 211979430. Its totient is φ = 211979428.

The previous prime is 211979419. The next prime is 211979437. The reversal of 211979429 is 924979112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183602500 + 28376929 = 13550^2 + 5327^2 .

It is a cyclic number.

It is not a de Polignac number, because 211979429 - 2⁴ = 211979413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211979429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211979419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105989714 + 105989715.

It is an arithmetic number, because the mean of its divisors is an integer number (105989715).

Almost surely, 2^211979429 is an apocalyptic number.

It is an amenable number.

211979429 is a deficient number, since it is larger than the sum of its proper divisors (1).

211979429 is an equidigital number, since it uses as much as digits as its factorization.

211979429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 44.

The square root of 211979429 is about 14559.5133503837. The cubic root of 211979429 is about 596.2539090878.

The spelling of 211979429 in words is "two hundred eleven million, nine hundred seventy-nine thousand, four hundred twenty-nine".