15212203217 has 2 divisors, whose sum is σ = 15212203218. Its totient is φ = 15212203216.

The previous prime is 15212203183. The next prime is 15212203247. The reversal of 15212203217 is 71230221251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7776417856 + 7435785361 = 88184^2 + 86231^2 .

It is a cyclic number.

It is not a de Polignac number, because 15212203217 - 2⁸ = 15212202961 is a prime.

It is a super-2 number, since 2×15212203217² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15212203247) 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, 7606101608 + 7606101609.

It is an arithmetic number, because the mean of its divisors is an integer number (7606101609).

Almost surely, 2^15212203217 is an apocalyptic number.

It is an amenable number.

15212203217 is a deficient number, since it is larger than the sum of its proper divisors (1).

15212203217 is an equidigital number, since it uses as much as digits as its factorization.

15212203217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 26.

Adding to 15212203217 its reverse (71230221251), we get a palindrome (86442424468).

The spelling of 15212203217 in words is "fifteen billion, two hundred twelve million, two hundred three thousand, two hundred seventeen".