1212211009957 has 2 divisors, whose sum is σ = 1212211009958. Its totient is φ = 1212211009956.

The previous prime is 1212211009943. The next prime is 1212211010027. The reversal of 1212211009957 is 7599001122121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 934855000641 + 277356009316 = 966879^2 + 526646^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212211009957 - 2²³ = 1212202621349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212211069957) 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, 606105504978 + 606105504979.

It is an arithmetic number, because the mean of its divisors is an integer number (606105504979).

Almost surely, 2^{1212211009957} is an apocalyptic number.

It is an amenable number.

1212211009957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212211009957 is an equidigital number, since it uses as much as digits as its factorization.

1212211009957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 40.

The spelling of 1212211009957 in words is "one trillion, two hundred twelve billion, two hundred eleven million, nine thousand, nine hundred fifty-seven".