11147970521 has 2 divisors, whose sum is σ = 11147970522. Its totient is φ = 11147970520.

The previous prime is 11147970391. The next prime is 11147970539. The reversal of 11147970521 is 12507974111.

11147970521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8772382921 + 2375587600 = 93661^2 + 48740^2 .

It is a cyclic number.

It is not a de Polignac number, because 11147970521 - 2²⁶ = 11080861657 is a prime.

It is a super-2 number, since 2×11147970521² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11147973521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5573985260 + 5573985261.

It is an arithmetic number, because the mean of its divisors is an integer number (5573985261).

Almost surely, 2^11147970521 is an apocalyptic number.

It is an amenable number.

11147970521 is a deficient number, since it is larger than the sum of its proper divisors (1).

11147970521 is an equidigital number, since it uses as much as digits as its factorization.

11147970521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640, while the sum is 38.

The spelling of 11147970521 in words is "eleven billion, one hundred forty-seven million, nine hundred seventy thousand, five hundred twenty-one".