1221231033073 has 2 divisors, whose sum is σ = 1221231033074. Its totient is φ = 1221231033072.

The previous prime is 1221231033041. The next prime is 1221231033079. The reversal of 1221231033073 is 3703301321221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1190003902129 + 31227130944 = 1090873^2 + 176712^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221231033073 - 2⁵ = 1221231033041 is a prime.

It is a super-2 number, since 2×1221231033073² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221231033079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610615516536 + 610615516537.

It is an arithmetic number, because the mean of its divisors is an integer number (610615516537).

Almost surely, 2^{1221231033073} is an apocalyptic number.

It is an amenable number.

1221231033073 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221231033073 is an equidigital number, since it uses as much as digits as its factorization.

1221231033073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 28.

Adding to 1221231033073 its reverse (3703301321221), we get a palindrome (4924532354294).

The spelling of 1221231033073 in words is "one trillion, two hundred twenty-one billion, two hundred thirty-one million, thirty-three thousand, seventy-three".