1212207914921 has 2 divisors, whose sum is σ = 1212207914922. Its totient is φ = 1212207914920.

The previous prime is 1212207914909. The next prime is 1212207914969. The reversal of 1212207914921 is 1294197022121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1205527141225 + 6680773696 = 1097965^2 + 81736^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212207914921 - 2¹⁴ = 1212207898537 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212207919921) 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, 606103957460 + 606103957461.

It is an arithmetic number, because the mean of its divisors is an integer number (606103957461).

Almost surely, 2^{1212207914921} is an apocalyptic number.

It is an amenable number.

1212207914921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212207914921 is an equidigital number, since it uses as much as digits as its factorization.

1212207914921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 41.

The spelling of 1212207914921 in words is "one trillion, two hundred twelve billion, two hundred seven million, nine hundred fourteen thousand, nine hundred twenty-one".