20012000101021 has 2 divisors, whose sum is σ = 20012000101022. Its totient is φ = 20012000101020.

The previous prime is 20012000101019. The next prime is 20012000101057. The reversal of 20012000101021 is 12010100021002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19407011704921 + 604988396100 = 4405339^2 + 777810^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012000101021 - 2¹ = 20012000101019 is a prime.

Together with 20012000101019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20012000100989 and 20012000101007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012000101421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006000050510 + 10006000050511.

It is an arithmetic number, because the mean of its divisors is an integer number (10006000050511).

Almost surely, 2^{20012000101021} is an apocalyptic number.

It is an amenable number.

20012000101021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012000101021 is an equidigital number, since it uses as much as digits as its factorization.

20012000101021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20012000101021 its reverse (12010100021002), we get a palindrome (32022100122023).

The spelling of 20012000101021 in words is "twenty trillion, twelve billion, one hundred one thousand, twenty-one".