1211021212001 has 2 divisors, whose sum is σ = 1211021212002. Its totient is φ = 1211021212000.

The previous prime is 1211021211931. The next prime is 1211021212003. The reversal of 1211021212001 is 1002121201121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1068287616400 + 142733595601 = 1033580^2 + 377801^2 .

It is an emirp because it is prime and its reverse (1002121201121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211021212001 - 2²⁶ = 1210954103137 is a prime.

Together with 1211021212003, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1211021212003) 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, 605510606000 + 605510606001.

It is an arithmetic number, because the mean of its divisors is an integer number (605510606001).

Almost surely, 2^{1211021212001} is an apocalyptic number.

It is an amenable number.

1211021212001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211021212001 is an equidigital number, since it uses as much as digits as its factorization.

1211021212001 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 14.

Adding to 1211021212001 its reverse (1002121201121), we get a palindrome (2213142413122).

The spelling of 1211021212001 in words is "one trillion, two hundred eleven billion, twenty-one million, two hundred twelve thousand, one".