211309429 has 8 divisors (see below), whose sum is σ = 215060888. Its totient is φ = 207567360.

The previous prime is 211309409. The next prime is 211309433. The reversal of 211309429 is 924903112.

211309429 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 36276529 + 175032900 = 6023^2 + 13230^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211309429 - 2²³ = 202920821 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211309429.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211309409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55309 + ... + 59005.

It is an arithmetic number, because the mean of its divisors is an integer number (26882611).

Almost surely, 2^211309429 is an apocalyptic number.

It is an amenable number.

211309429 is a deficient number, since it is larger than the sum of its proper divisors (3751459).

211309429 is an equidigital number, since it uses as much as digits as its factorization.

211309429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4695.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 211309429 is about 14536.4861297358. The cubic root of 211309429 is about 595.6250560132.

The spelling of 211309429 in words is "two hundred eleven million, three hundred nine thousand, four hundred twenty-nine".