20110020101021 has 2 divisors, whose sum is σ = 20110020101022. Its totient is φ = 20110020101020.

The previous prime is 20110020100979. The next prime is 20110020101033. The reversal of 20110020101021 is 12010102001102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19727712844921 + 382307256100 = 4441589^2 + 618310^2 .

It is a cyclic number.

It is not a de Polignac number, because 20110020101021 - 2¹⁰ = 20110020099997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20110020100993 and 20110020101011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20110020103021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055010050510 + 10055010050511.

It is an arithmetic number, because the mean of its divisors is an integer number (10055010050511).

Almost surely, 2^{20110020101021} is an apocalyptic number.

It is an amenable number.

20110020101021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20110020101021 is an equidigital number, since it uses as much as digits as its factorization.

20110020101021 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 11.

Adding to 20110020101021 its reverse (12010102001102), we get a palindrome (32120122102123).

The spelling of 20110020101021 in words is "twenty trillion, one hundred ten billion, twenty million, one hundred one thousand, twenty-one".