12021020001 has 16 divisors (see below), whose sum is σ = 18187833600. Its totient is φ = 7843501584.

The previous prime is 12021019949. The next prime is 12021020129. The reversal of 12021020001 is 10002012021.

It is not a de Polignac number, because 12021020001 - 2⁹ = 12021019489 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (12021020801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4735146 + ... + 4737683.

It is an arithmetic number, because the mean of its divisors is an integer number (1136739600).

Almost surely, 2^12021020001 is an apocalyptic number.

It is an amenable number.

12021020001 is a deficient number, since it is larger than the sum of its proper divisors (6166813599).

12021020001 is an equidigital number, since it uses as much as digits as its factorization.

12021020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9472885 (or 9472879 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 12021020001 its reverse (10002012021), we get a palindrome (22023032022).

The spelling of 12021020001 in words is "twelve billion, twenty-one million, twenty thousand, one".