211604401 has 2 divisors, whose sum is σ = 211604402. Its totient is φ = 211604400.

The previous prime is 211604399. The next prime is 211604413. The reversal of 211604401 is 104406112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135024400 + 76580001 = 11620^2 + 8751^2 .

It is a cyclic number.

It is not a de Polignac number, because 211604401 - 2¹ = 211604399 is a prime.

Together with 211604399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (211604801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105802200 + 105802201.

It is an arithmetic number, because the mean of its divisors is an integer number (105802201).

Almost surely, 2^211604401 is an apocalyptic number.

211604401 is the 7776-th centered heptagonal number.

It is an amenable number.

211604401 is a deficient number, since it is larger than the sum of its proper divisors (1).

211604401 is an equidigital number, since it uses as much as digits as its factorization.

211604401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 211604401 is about 14546.6285097269. The cubic root of 211604401 is about 595.9020763477.

The spelling of 211604401 in words is "two hundred eleven million, six hundred four thousand, four hundred one".