1223033131721 has 2 divisors, whose sum is σ = 1223033131722. Its totient is φ = 1223033131720.

The previous prime is 1223033131693. The next prime is 1223033131757. The reversal of 1223033131721 is 1271313303221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1081100857600 + 141932274121 = 1039760^2 + 376739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1223033131721 is a prime.

It is not a weakly prime, because it can be changed into another prime (1223033137721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611516565860 + 611516565861.

It is an arithmetic number, because the mean of its divisors is an integer number (611516565861).

Almost surely, 2^{1223033131721} is an apocalyptic number.

It is an amenable number.

1223033131721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223033131721 is an equidigital number, since it uses as much as digits as its factorization.

1223033131721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 29.

Adding to 1223033131721 its reverse (1271313303221), we get a palindrome (2494346434942).

The spelling of 1223033131721 in words is "one trillion, two hundred twenty-three billion, thirty-three million, one hundred thirty-one thousand, seven hundred twenty-one".