1213012202021 has 2 divisors, whose sum is σ = 1213012202022. Its totient is φ = 1213012202020.

The previous prime is 1213012202009. The next prime is 1213012202071. The reversal of 1213012202021 is 1202022103121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 982457616100 + 230554585921 = 991190^2 + 480161^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213012202021 - 2¹⁸ = 1213011939877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213012202071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606506101010 + 606506101011.

It is an arithmetic number, because the mean of its divisors is an integer number (606506101011).

Almost surely, 2^{1213012202021} is an apocalyptic number.

It is an amenable number.

1213012202021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213012202021 is an equidigital number, since it uses as much as digits as its factorization.

1213012202021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 1213012202021 its reverse (1202022103121), we get a palindrome (2415034305142).

The spelling of 1213012202021 in words is "one trillion, two hundred thirteen billion, twelve million, two hundred two thousand, twenty-one".