1341220221821 has 2 divisors, whose sum is σ = 1341220221822. Its totient is φ = 1341220221820.

The previous prime is 1341220221701. The next prime is 1341220221827. The reversal of 1341220221821 is 1281220221431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1328980118596 + 12240103225 = 1152814^2 + 110635^2 .

It is a cyclic number.

It is not a de Polignac number, because 1341220221821 - 2³⁴ = 1324040352637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1341220221827) 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, 670610110910 + 670610110911.

It is an arithmetic number, because the mean of its divisors is an integer number (670610110911).

Almost surely, 2^{1341220221821} is an apocalyptic number.

It is an amenable number.

1341220221821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1341220221821 is an equidigital number, since it uses as much as digits as its factorization.

1341220221821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 29.

The spelling of 1341220221821 in words is "one trillion, three hundred forty-one billion, two hundred twenty million, two hundred twenty-one thousand, eight hundred twenty-one".