1221400003121 has 2 divisors, whose sum is σ = 1221400003122. Its totient is φ = 1221400003120.

The previous prime is 1221400003099. The next prime is 1221400003127. The reversal of 1221400003121 is 1213000041221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 646094440000 + 575305563121 = 803800^2 + 758489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221400003121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221400003121.

It is not a weakly prime, because it can be changed into another prime (1221400003127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610700001560 + 610700001561.

It is an arithmetic number, because the mean of its divisors is an integer number (610700001561).

Almost surely, 2^{1221400003121} is an apocalyptic number.

It is an amenable number.

1221400003121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221400003121 is an equidigital number, since it uses as much as digits as its factorization.

1221400003121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 1221400003121 its reverse (1213000041221), we get a palindrome (2434400044342).

The spelling of 1221400003121 in words is "one trillion, two hundred twenty-one billion, four hundred million, three thousand, one hundred twenty-one".