213622121 has 2 divisors, whose sum is σ = 213622122. Its totient is φ = 213622120.

The previous prime is 213622069. The next prime is 213622217. The reversal of 213622121 is 121226312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116402521 + 97219600 = 10789^2 + 9860^2 .

It is a cyclic number.

It is not a de Polignac number, because 213622121 - 2¹⁰ = 213621097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213622093 and 213622102.

It is not a weakly prime, because it can be changed into another prime (213622021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106811060 + 106811061.

It is an arithmetic number, because the mean of its divisors is an integer number (106811061).

Almost surely, 2^213622121 is an apocalyptic number.

It is an amenable number.

213622121 is a deficient number, since it is larger than the sum of its proper divisors (1).

213622121 is an equidigital number, since it uses as much as digits as its factorization.

213622121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 20.

The square root of 213622121 is about 14615.8174933871. The cubic root of 213622121 is about 597.7901309759.

Adding to 213622121 its reverse (121226312), we get a palindrome (334848433).

The spelling of 213622121 in words is "two hundred thirteen million, six hundred twenty-two thousand, one hundred twenty-one".