1211011330021 has 2 divisors, whose sum is σ = 1211011330022. Its totient is φ = 1211011330020.

The previous prime is 1211011329989. The next prime is 1211011330051. The reversal of 1211011330021 is 1200331101121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 803219250625 + 407792079396 = 896225^2 + 638586^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211011330021 - 2⁵ = 1211011329989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211011329977 and 1211011330004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211011330051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605505665010 + 605505665011.

It is an arithmetic number, because the mean of its divisors is an integer number (605505665011).

Almost surely, 2^{1211011330021} is an apocalyptic number.

It is an amenable number.

1211011330021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211011330021 is an equidigital number, since it uses as much as digits as its factorization.

1211011330021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 1211011330021 its reverse (1200331101121), we get a palindrome (2411342431142).

The spelling of 1211011330021 in words is "one trillion, two hundred eleven billion, eleven million, three hundred thirty thousand, twenty-one".