2121212147 has 2 divisors, whose sum is σ = 2121212148. Its totient is φ = 2121212146.

The previous prime is 2121212101. The next prime is 2121212189. The reversal of 2121212147 is 7412121212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2121212147 - 2¹⁴ = 2121195763 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (2121212447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060606073 + 1060606074.

It is an arithmetic number, because the mean of its divisors is an integer number (1060606074).

Almost surely, 2^2121212147 is an apocalyptic number.

2121212147 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121212147 is an equidigital number, since it uses as much as digits as its factorization.

2121212147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 448, while the sum is 23.

The square root of 2121212147 is about 46056.6189271423. The cubic root of 2121212147 is about 1284.8764479210.

Adding to 2121212147 its reverse (7412121212), we get a palindrome (9533333359).

The spelling of 2121212147 in words is "two billion, one hundred twenty-one million, two hundred twelve thousand, one hundred forty-seven".