12000020021 has 8 divisors (see below), whose sum is σ = 13100565888. Its totient is φ = 10901080000.

The previous prime is 12000020009. The next prime is 12000020029. The reversal of 12000020021 is 12002000021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12000020021 - 2¹⁸ = 11999757877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12000019990 and 12000020008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12000020029) 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, 385805 + ... + 415746.

It is an arithmetic number, because the mean of its divisors is an integer number (1637570736).

Almost surely, 2^12000020021 is an apocalyptic number.

12000020021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12000020021 is a deficient number, since it is larger than the sum of its proper divisors (1100545867).

12000020021 is a wasteful number, since it uses less digits than its factorization.

12000020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802923.

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

Adding to 12000020021 its reverse (12002000021), we get a palindrome (24002020042).

The spelling of 12000020021 in words is "twelve billion, twenty thousand, twenty-one".