1211101212001 has 2 divisors, whose sum is σ = 1211101212002. Its totient is φ = 1211101212000.

The previous prime is 1211101211987. The next prime is 1211101212017. The reversal of 1211101212001 is 1002121011121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 940513979601 + 270587232400 = 969801^2 + 520180^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211101212001 - 2¹¹ = 1211101209953 is a prime.

It is a super-2 number, since 2×1211101212001² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1211101213001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605550606000 + 605550606001.

It is an arithmetic number, because the mean of its divisors is an integer number (605550606001).

Almost surely, 2^{1211101212001} is an apocalyptic number.

It is an amenable number.

1211101212001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211101212001 is an equidigital number, since it uses as much as digits as its factorization.

1211101212001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1211101212001 its reverse (1002121011121), we get a palindrome (2213222223122).

The spelling of 1211101212001 in words is "one trillion, two hundred eleven billion, one hundred one million, two hundred twelve thousand, one".