12021507306 has 24 divisors (see below), whose sum is σ = 26051802660. Its totient is φ = 4006368576.

The previous prime is 12021507287. The next prime is 12021507319. The reversal of 12021507306 is 60370512021.

It is a happy number.

12021507306 is a `hidden beast` number, since 1 + 202 + 150 + 7 + 306 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7073651025 + 4947856281 = 84105^2 + 70341^2 .

It is a super-2 number, since 2×12021507306² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12021507306.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29656 + ... + 157868.

Almost surely, 2^12021507306 is an apocalyptic number.

12021507306 is an abundant number, since it is smaller than the sum of its proper divisors (14030295354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12021507306 is a wasteful number, since it uses less digits than its factorization.

12021507306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133430 (or 133427 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The spelling of 12021507306 in words is "twelve billion, twenty-one million, five hundred seven thousand, three hundred six".