212211409 has 8 divisors (see below), whose sum is σ = 222768000. Its totient is φ = 201765696.

The previous prime is 212211397. The next prime is 212211421. The reversal of 212211409 is 904112212.

It is an interprime number because it is at equal distance from previous prime (212211397) and next prime (212211421).

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 212211409 - 2⁹ = 212210897 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 212211409.

It is not an unprimeable number, because it can be changed into a prime (212211469) 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 in 7 ways as a sum of consecutive naturals, for example, 23784 + ... + 31465.

It is an arithmetic number, because the mean of its divisors is an integer number (27846000).

Almost surely, 2^212211409 is an apocalyptic number.

It is an amenable number.

212211409 is a deficient number, since it is larger than the sum of its proper divisors (10556591).

212211409 is a wasteful number, since it uses less digits than its factorization.

212211409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55439.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 212211409 is about 14567.4777844348. The cubic root of 212211409 is about 596.4713335750.

It can be divided in two parts, 2122 and 11409, that added together give a palindrome (13531).

The spelling of 212211409 in words is "two hundred twelve million, two hundred eleven thousand, four hundred nine".