20011020210021 has 16 divisors (see below), whose sum is σ = 27271634579136. Its totient is φ = 13047151368576.

The previous prime is 20011020210007. The next prime is 20011020210023. The reversal of 20011020210021 is 12001202011002.

It is not a de Polignac number, because 20011020210021 - 2¹⁰ = 20011020208997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20011020209979 and 20011020210006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011020210023) 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, 200997315 + ... + 201096848.

It is an arithmetic number, because the mean of its divisors is an integer number (1704477161196).

Almost surely, 2^{20011020210021} is an apocalyptic number.

It is an amenable number.

20011020210021 is a deficient number, since it is larger than the sum of its proper divisors (7260614369115).

20011020210021 is a wasteful number, since it uses less digits than its factorization.

20011020210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402094532.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20011020210021 its reverse (12001202011002), we get a palindrome (32012222221023).

The spelling of 20011020210021 in words is "twenty trillion, eleven billion, twenty million, two hundred ten thousand, twenty-one".