1221021110063 has 2 divisors, whose sum is σ = 1221021110064. Its totient is φ = 1221021110062.

The previous prime is 1221021110047. The next prime is 1221021110093. The reversal of 1221021110063 is 3600111201221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221021110063 - 2⁴ = 1221021110047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221021110093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610510555031 + 610510555032.

It is an arithmetic number, because the mean of its divisors is an integer number (610510555032).

Almost surely, 2^{1221021110063} is an apocalyptic number.

1221021110063 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221021110063 is an equidigital number, since it uses as much as digits as its factorization.

1221021110063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1221021110063 its reverse (3600111201221), we get a palindrome (4821132311284).

The spelling of 1221021110063 in words is "one trillion, two hundred twenty-one billion, twenty-one million, one hundred ten thousand, sixty-three".