164212121 has 2 divisors, whose sum is σ = 164212122. Its totient is φ = 164212120.

The previous prime is 164212067. The next prime is 164212127. The reversal of 164212121 is 121212461.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116877721 + 47334400 = 10811^2 + 6880^2 .

It is a cyclic number.

It is not a de Polignac number, because 164212121 - 2¹⁰ = 164211097 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 164212093 and 164212102.

It is not a weakly prime, because it can be changed into another prime (164212127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82106060 + 82106061.

It is an arithmetic number, because the mean of its divisors is an integer number (82106061).

Almost surely, 2^164212121 is an apocalyptic number.

It is an amenable number.

164212121 is a deficient number, since it is larger than the sum of its proper divisors (1).

164212121 is an equidigital number, since it uses as much as digits as its factorization.

164212121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 20.

The square root of 164212121 is about 12814.5277322264. The cubic root of 164212121 is about 547.6062592004.

Adding to 164212121 its reverse (121212461), we get a palindrome (285424582).

The spelling of 164212121 in words is "one hundred sixty-four million, two hundred twelve thousand, one hundred twenty-one".