1221232112101 has 2 divisors, whose sum is σ = 1221232112102. Its totient is φ = 1221232112100.

The previous prime is 1221232112081. The next prime is 1221232112117. The reversal of 1221232112101 is 1012112321221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 855993189601 + 365238922500 = 925199^2 + 604350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221232112101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221232112171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610616056050 + 610616056051.

It is an arithmetic number, because the mean of its divisors is an integer number (610616056051).

Almost surely, 2^{1221232112101} is an apocalyptic number.

It is an amenable number.

1221232112101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221232112101 is an equidigital number, since it uses as much as digits as its factorization.

1221232112101 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 19.

Adding to 1221232112101 its reverse (1012112321221), we get a palindrome (2233344433322).

The spelling of 1221232112101 in words is "one trillion, two hundred twenty-one billion, two hundred thirty-two million, one hundred twelve thousand, one hundred one".