1211212151 has 2 divisors, whose sum is σ = 1211212152. Its totient is φ = 1211212150.

The previous prime is 1211212117. The next prime is 1211212159. The reversal of 1211212151 is 1512121121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1211212151 - 2¹⁸ = 1210950007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211212159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605606075 + 605606076.

It is an arithmetic number, because the mean of its divisors is an integer number (605606076).

Almost surely, 2^1211212151 is an apocalyptic number.

1211212151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211212151 is an equidigital number, since it uses as much as digits as its factorization.

1211212151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40, while the sum is 17.

The square root of 1211212151 is about 34802.4733460138. The cubic root of 1211212151 is about 1065.9579501921.

Adding to 1211212151 its reverse (1512121121), we get a palindrome (2723333272).

The spelling of 1211212151 in words is "one billion, two hundred eleven million, two hundred twelve thousand, one hundred fifty-one".