15221611441 has 2 divisors, whose sum is σ = 15221611442. Its totient is φ = 15221611440.

The previous prime is 15221611373. The next prime is 15221611463. The reversal of 15221611441 is 14411612251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15208069041 + 13542400 = 123321^2 + 3680^2 .

It is a cyclic number.

It is not a de Polignac number, because 15221611441 - 2¹¹ = 15221609393 is a prime.

It is not a weakly prime, because it can be changed into another prime (15221111441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7610805720 + 7610805721.

It is an arithmetic number, because the mean of its divisors is an integer number (7610805721).

Almost surely, 2^15221611441 is an apocalyptic number.

It is an amenable number.

15221611441 is a deficient number, since it is larger than the sum of its proper divisors (1).

15221611441 is an equidigital number, since it uses as much as digits as its factorization.

15221611441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 28.

The spelling of 15221611441 in words is "fifteen billion, two hundred twenty-one million, six hundred eleven thousand, four hundred forty-one".