1221004133243 has 2 divisors, whose sum is σ = 1221004133244. Its totient is φ = 1221004133242.

The previous prime is 1221004133203. The next prime is 1221004133291. The reversal of 1221004133243 is 3423314001221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221004133243 - 2³⁶ = 1152284656507 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221004133203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610502066621 + 610502066622.

It is an arithmetic number, because the mean of its divisors is an integer number (610502066622).

Almost surely, 2^{1221004133243} is an apocalyptic number.

1221004133243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221004133243 is an equidigital number, since it uses as much as digits as its factorization.

1221004133243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 1221004133243 its reverse (3423314001221), we get a palindrome (4644318134464).

The spelling of 1221004133243 in words is "one trillion, two hundred twenty-one billion, four million, one hundred thirty-three thousand, two hundred forty-three".