20001202000021 has 4 divisors (see below), whose sum is σ = 21819493090944. Its totient is φ = 18182910909100.

The previous prime is 20001202000009. The next prime is 20001202000051. The reversal of 20001202000021 is 12000020210002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20001202000021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001201999971 and 20001202000007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001202000001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 909145545445 + ... + 909145545466.

It is an arithmetic number, because the mean of its divisors is an integer number (5454873272736).

Almost surely, 2^{20001202000021} is an apocalyptic number.

It is an amenable number.

20001202000021 is a deficient number, since it is larger than the sum of its proper divisors (1818291090923).

20001202000021 is a wasteful number, since it uses less digits than its factorization.

20001202000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818291090922.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20001202000021 its reverse (12000020210002), we get a palindrome (32001222210023).

It can be divided in two parts, 2000 and 1202000021, that added together give a palindrome (1202002021).

The spelling of 20001202000021 in words is "twenty trillion, one billion, two hundred two million, twenty-one", and thus it is an aban number.