1212201001021 has 2 divisors, whose sum is σ = 1212201001022. Its totient is φ = 1212201001020.

The previous prime is 1212201001019. The next prime is 1212201001057. The reversal of 1212201001021 is 1201001022121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1063660132921 + 148540868100 = 1031339^2 + 385410^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212201001021 - 2¹ = 1212201001019 is a prime.

Together with 1212201001019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1212201000992 and 1212201001010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212201001421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606100500510 + 606100500511.

It is an arithmetic number, because the mean of its divisors is an integer number (606100500511).

Almost surely, 2^{1212201001021} is an apocalyptic number.

It is an amenable number.

1212201001021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212201001021 is an equidigital number, since it uses as much as digits as its factorization.

1212201001021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1212201001021 its reverse (1201001022121), we get a palindrome (2413202023142).

The spelling of 1212201001021 in words is "one trillion, two hundred twelve billion, two hundred one million, one thousand, twenty-one".