20112020021 has 2 divisors, whose sum is σ = 20112020022. Its totient is φ = 20112020020.

The previous prime is 20112019969. The next prime is 20112020041. The reversal of 20112020021 is 12002021102.

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., 11874460900 + 8237559121 = 108970^2 + 90761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20112020021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20112019984 and 20112020011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20112020041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10056010010 + 10056010011.

It is an arithmetic number, because the mean of its divisors is an integer number (10056010011).

Almost surely, 2^20112020021 is an apocalyptic number.

It is an amenable number.

20112020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20112020021 is an equidigital number, since it uses as much as digits as its factorization.

20112020021 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 20112020021 its reverse (12002021102), we get a palindrome (32114041123).

The spelling of 20112020021 in words is "twenty billion, one hundred twelve million, twenty thousand, twenty-one".