12021005616 has 40 divisors (see below), whose sum is σ = 31063321344. Its totient is φ = 4005833280.

The previous prime is 12021005603. The next prime is 12021005617. The reversal of 12021005616 is 61650012021.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (12021005617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138421 + ... + 207851.

Almost surely, 2^12021005616 is an apocalyptic number.

12021005616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12021005616 is an abundant number, since it is smaller than the sum of its proper divisors (19042315728).

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

12021005616 is a wasteful number, since it uses less digits than its factorization.

12021005616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73049 (or 73043 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

Adding to 12021005616 its reverse (61650012021), we get a palindrome (73671017637).

The spelling of 12021005616 in words is "twelve billion, twenty-one million, five thousand, six hundred sixteen".