154216121 has 2 divisors, whose sum is σ = 154216122. Its totient is φ = 154216120.

The previous prime is 154216091. The next prime is 154216133. The reversal of 154216121 is 121612451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149108521 + 5107600 = 12211^2 + 2260^2 .

It is a cyclic number.

It is not a de Polignac number, because 154216121 - 2⁶ = 154216057 is a prime.

It is a super-2 number, since 2×154216121² = 47565223952573282, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (154213121) 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 as a sum of consecutive naturals, namely, 77108060 + 77108061.

It is an arithmetic number, because the mean of its divisors is an integer number (77108061).

Almost surely, 2^154216121 is an apocalyptic number.

It is an amenable number.

154216121 is a deficient number, since it is larger than the sum of its proper divisors (1).

154216121 is an equidigital number, since it uses as much as digits as its factorization.

154216121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 23.

The square root of 154216121 is about 12418.3783562911. The cubic root of 154216121 is about 536.2614667468.

Adding to 154216121 its reverse (121612451), we get a palindrome (275828572).

The spelling of 154216121 in words is "one hundred fifty-four million, two hundred sixteen thousand, one hundred twenty-one".