1211044403021 has 2 divisors, whose sum is σ = 1211044403022. Its totient is φ = 1211044403020.

The previous prime is 1211044402991. The next prime is 1211044403069. The reversal of 1211044403021 is 1203044401121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 994828702921 + 216215700100 = 997411^2 + 464990^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211044403021 - 2¹⁸ = 1211044140877 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211049403021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605522201510 + 605522201511.

It is an arithmetic number, because the mean of its divisors is an integer number (605522201511).

Almost surely, 2^{1211044403021} is an apocalyptic number.

It is an amenable number.

1211044403021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211044403021 is an equidigital number, since it uses as much as digits as its factorization.

1211044403021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 1211044403021 its reverse (1203044401121), we get a palindrome (2414088804142).

The spelling of 1211044403021 in words is "one trillion, two hundred eleven billion, forty-four million, four hundred three thousand, twenty-one".