15204230221 has 2 divisors, whose sum is σ = 15204230222. Its totient is φ = 15204230220.

The previous prime is 15204230191. The next prime is 15204230227. The reversal of 15204230221 is 12203240251.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15193274121 + 10956100 = 123261^2 + 3310^2 .

It is a cyclic number.

It is not a de Polignac number, because 15204230221 - 2¹⁵ = 15204197453 is a prime.

It is a super-2 number, since 2×15204230221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15204230192 and 15204230201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15204230227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7602115110 + 7602115111.

It is an arithmetic number, because the mean of its divisors is an integer number (7602115111).

Almost surely, 2^15204230221 is an apocalyptic number.

It is an amenable number.

15204230221 is a deficient number, since it is larger than the sum of its proper divisors (1).

15204230221 is an equidigital number, since it uses as much as digits as its factorization.

15204230221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 15204230221 its reverse (12203240251), we get a palindrome (27407470472).

The spelling of 15204230221 in words is "fifteen billion, two hundred four million, two hundred thirty thousand, two hundred twenty-one".