20200012001021 has 2 divisors, whose sum is σ = 20200012001022. Its totient is φ = 20200012001020.

The previous prime is 20200012001009. The next prime is 20200012001023. The reversal of 20200012001021 is 12010021000202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13309990737796 + 6890021263225 = 3648286^2 + 2624885^2 .

It is a cyclic number.

It is not a de Polignac number, because 20200012001021 - 2¹⁰ = 20200011999997 is a prime.

It is a Sophie Germain prime.

Together with 20200012001023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20200012000993 and 20200012001011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20200012001023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100006000510 + 10100006000511.

It is an arithmetic number, because the mean of its divisors is an integer number (10100006000511).

Almost surely, 2^{20200012001021} is an apocalyptic number.

It is an amenable number.

20200012001021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20200012001021 is an equidigital number, since it uses as much as digits as its factorization.

20200012001021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20200012001021 its reverse (12010021000202), we get a palindrome (32210033001223).

The spelling of 20200012001021 in words is "twenty trillion, two hundred billion, twelve million, one thousand, twenty-one".