1212211220251 has 2 divisors, whose sum is σ = 1212211220252. Its totient is φ = 1212211220250.

The previous prime is 1212211220197. The next prime is 1212211220291. The reversal of 1212211220251 is 1520221122121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1212211220251 - 2¹¹ = 1212211218203 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212211220291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606105610125 + 606105610126.

It is an arithmetic number, because the mean of its divisors is an integer number (606105610126).

Almost surely, 2^{1212211220251} is an apocalyptic number.

1212211220251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212211220251 is an equidigital number, since it uses as much as digits as its factorization.

1212211220251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 22.

Adding to 1212211220251 its reverse (1520221122121), we get a palindrome (2732432342372).

The spelling of 1212211220251 in words is "one trillion, two hundred twelve billion, two hundred eleven million, two hundred twenty thousand, two hundred fifty-one".