12057221506 has 32 divisors (see below), whose sum is σ = 20706979968. Its totient is φ = 5211930240.

The previous prime is 12057221497. The next prime is 12057221513. The reversal of 12057221506 is 60512275021.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18670 + ... + 156406.

It is an arithmetic number, because the mean of its divisors is an integer number (647093124).

Almost surely, 2^12057221506 is an apocalyptic number.

12057221506 is a deficient number, since it is larger than the sum of its proper divisors (8649758462).

12057221506 is a wasteful number, since it uses less digits than its factorization.

12057221506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137946.

The product of its (nonzero) digits is 8400, while the sum is 31.

Adding to 12057221506 its reverse (60512275021), we get a palindrome (72569496527).

The spelling of 12057221506 in words is "twelve billion, fifty-seven million, two hundred twenty-one thousand, five hundred six".