15221226231 has 6 divisors (see below), whose sum is σ = 21986215680. Its totient is φ = 10147484148.

The previous prime is 15221226187. The next prime is 15221226247. The reversal of 15221226231 is 13262212251.

15221226231 is a `hidden beast` number, since 1 + 5 + 22 + 12 + 2 + 623 + 1 = 666.

It is not a de Polignac number, because 15221226231 - 2⁷ = 15221226103 is a prime.

It is a super-2 number, since 2×15221226231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15221226195 and 15221226204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15221222231) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 845623671 + ... + 845623688.

It is an arithmetic number, because the mean of its divisors is an integer number (3664369280).

Almost surely, 2^15221226231 is an apocalyptic number.

15221226231 is a deficient number, since it is larger than the sum of its proper divisors (6764989449).

15221226231 is a wasteful number, since it uses less digits than its factorization.

15221226231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691247365 (or 1691247362 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

Adding to 15221226231 its reverse (13262212251), we get a palindrome (28483438482).

The spelling of 15221226231 in words is "fifteen billion, two hundred twenty-one million, two hundred twenty-six thousand, two hundred thirty-one".