11221329521 has 2 divisors, whose sum is σ = 11221329522. Its totient is φ = 11221329520.

The previous prime is 11221329487. The next prime is 11221329523. The reversal of 11221329521 is 12592312211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11219046400 + 2283121 = 105920^2 + 1511^2 .

It is a cyclic number.

It is not a de Polignac number, because 11221329521 - 2¹⁰ = 11221328497 is a prime.

Together with 11221329523, 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 (11221329523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610664760 + 5610664761.

It is an arithmetic number, because the mean of its divisors is an integer number (5610664761).

Almost surely, 2^11221329521 is an apocalyptic number.

It is an amenable number.

11221329521 is a deficient number, since it is larger than the sum of its proper divisors (1).

11221329521 is an equidigital number, since it uses as much as digits as its factorization.

11221329521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 29.

The spelling of 11221329521 in words is "eleven billion, two hundred twenty-one million, three hundred twenty-nine thousand, five hundred twenty-one".