15221272747 has 2 divisors, whose sum is σ = 15221272748. Its totient is φ = 15221272746.

The previous prime is 15221272727. The next prime is 15221272753. The reversal of 15221272747 is 74727212251.

It is a strong prime.

It is an emirp because it is prime and its reverse (74727212251) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15221272747 - 2²⁷ = 15087055019 is a prime.

It is not a weakly prime, because it can be changed into another prime (15221272727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7610636373 + 7610636374.

It is an arithmetic number, because the mean of its divisors is an integer number (7610636374).

Almost surely, 2^15221272747 is an apocalyptic number.

15221272747 is a deficient number, since it is larger than the sum of its proper divisors (1).

15221272747 is an equidigital number, since it uses as much as digits as its factorization.

15221272747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 109760, while the sum is 40.

Adding to 15221272747 its reverse (74727212251), we get a palindrome (89948484998).

The spelling of 15221272747 in words is "fifteen billion, two hundred twenty-one million, two hundred seventy-two thousand, seven hundred forty-seven".