11111211201001 has 2 divisors, whose sum is σ = 11111211201002. Its totient is φ = 11111211201000.

The previous prime is 11111211200987. The next prime is 11111211201007. The reversal of 11111211201001 is 10010211211111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8904560370601 + 2206650830400 = 2984051^2 + 1485480^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111211201001 - 2⁴¹ = 8912187945449 is a prime.

It is not a weakly prime, because it can be changed into another prime (11111211201007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555605600500 + 5555605600501.

It is an arithmetic number, because the mean of its divisors is an integer number (5555605600501).

Almost surely, 2^{11111211201001} is an apocalyptic number.

It is an amenable number.

11111211201001 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111211201001 is an equidigital number, since it uses as much as digits as its factorization.

11111211201001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 11111211201001 its reverse (10010211211111), we get a palindrome (21121422412112).

It can be divided in two parts, 11111 and 211201001, that added together give a palindrome (211212112).

The spelling of 11111211201001 in words is "eleven trillion, one hundred eleven billion, two hundred eleven million, two hundred one thousand, one".