211224401 has 4 divisors (see below), whose sum is σ = 214377072. Its totient is φ = 208071732.

The previous prime is 211224389. The next prime is 211224407. The reversal of 211224401 is 104422112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211224401 - 2¹⁰ = 211223377 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 211224401.

It is not an unprimeable number, because it can be changed into a prime (211224407) 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 3 ways as a sum of consecutive naturals, for example, 1576235 + ... + 1576368.

It is an arithmetic number, because the mean of its divisors is an integer number (53594268).

Almost surely, 2^211224401 is an apocalyptic number.

It is an amenable number.

211224401 is a deficient number, since it is larger than the sum of its proper divisors (3152671).

211224401 is an equidigital number, since it uses as much as digits as its factorization.

211224401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3152670.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 211224401 is about 14533.5611946969. The cubic root of 211224401 is about 595.5451548591.

Adding to 211224401 its reverse (104422112), we get a palindrome (315646513).

The spelling of 211224401 in words is "two hundred eleven million, two hundred twenty-four thousand, four hundred one".