1221513214633 has 2 divisors, whose sum is σ = 1221513214634. Its totient is φ = 1221513214632.

The previous prime is 1221513214549. The next prime is 1221513214637. The reversal of 1221513214633 is 3364123151221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1080867963904 + 140645250729 = 1039648^2 + 375027^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221513214633 - 2²⁵ = 1221479660201 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221513214637) 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, 610756607316 + 610756607317.

It is an arithmetic number, because the mean of its divisors is an integer number (610756607317).

Almost surely, 2^{1221513214633} is an apocalyptic number.

It is an amenable number.

1221513214633 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221513214633 is an equidigital number, since it uses as much as digits as its factorization.

1221513214633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 34.

Adding to 1221513214633 its reverse (3364123151221), we get a palindrome (4585636365854).

The spelling of 1221513214633 in words is "one trillion, two hundred twenty-one billion, five hundred thirteen million, two hundred fourteen thousand, six hundred thirty-three".