11001101201521 has 2 divisors, whose sum is σ = 11001101201522. Its totient is φ = 11001101201520.

The previous prime is 11001101201509. The next prime is 11001101201549. The reversal of 11001101201521 is 12510210110011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6356046054400 + 4645055147121 = 2521120^2 + 2155239^2 .

It is an emirp because it is prime and its reverse (12510210110011) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11001101201521 is a prime.

It is a super-2 number, since 2×11001101201521² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11001101201495 and 11001101201504.

It is not a weakly prime, because it can be changed into another prime (11001101201591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5500550600760 + 5500550600761.

It is an arithmetic number, because the mean of its divisors is an integer number (5500550600761).

Almost surely, 2^{11001101201521} is an apocalyptic number.

It is an amenable number.

11001101201521 is a deficient number, since it is larger than the sum of its proper divisors (1).

11001101201521 is an equidigital number, since it uses as much as digits as its factorization.

11001101201521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20, while the sum is 16.

Adding to 11001101201521 its reverse (12510210110011), we get a palindrome (23511311311532).

The spelling of 11001101201521 in words is "eleven trillion, one billion, one hundred one million, two hundred one thousand, five hundred twenty-one".