12021620506 has 24 divisors (see below), whose sum is σ = 21320388756. Its totient is φ = 5067659520.

The previous prime is 12021620503. The next prime is 12021620551. The reversal of 12021620506 is 60502612021.

It can be written as a sum of positive squares in 2 ways, for example, as 9943081225 + 2078539281 = 99715^2 + 45591^2 .

It is not an unprimeable number, because it can be changed into a prime (12021620503) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 999511 + ... + 1011466.

Almost surely, 2^12021620506 is an apocalyptic number.

12021620506 is a deficient number, since it is larger than the sum of its proper divisors (9298768250).

12021620506 is a wasteful number, since it uses less digits than its factorization.

12021620506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011054 (or 2011047 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The spelling of 12021620506 in words is "twelve billion, twenty-one million, six hundred twenty thousand, five hundred six".