20012002102021 has 4 divisors (see below), whose sum is σ = 20012023871532. Its totient is φ = 20011980332512.

The previous prime is 20012002101989. The next prime is 20012002102039. The reversal of 20012002102021 is 12020120021002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6190069360225 + 13821932741796 = 2487985^2 + 3717786^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012002102021 - 2⁵ = 20012002101989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20012002101992 and 20012002102010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012002102121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9442120 + ... + 11365633.

It is an arithmetic number, because the mean of its divisors is an integer number (5003005967883).

Almost surely, 2^{20012002102021} is an apocalyptic number.

It is an amenable number.

20012002102021 is a deficient number, since it is larger than the sum of its proper divisors (21769511).

20012002102021 is an equidigital number, since it uses as much as digits as its factorization.

20012002102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21769510.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20012002102021 its reverse (12020120021002), we get a palindrome (32032122123023).

The spelling of 20012002102021 in words is "twenty trillion, twelve billion, two million, one hundred two thousand, twenty-one".