20212000021 has 2 divisors, whose sum is σ = 20212000022. Its totient is φ = 20212000020.

The previous prime is 20212000013. The next prime is 20212000069. The reversal of 20212000021 is 12000021202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12452328100 + 7759671921 = 111590^2 + 88089^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212000021 - 2³ = 20212000013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20211999971 and 20212000007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20212000001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106000010 + 10106000011.

It is an arithmetic number, because the mean of its divisors is an integer number (10106000011).

Almost surely, 2^20212000021 is an apocalyptic number.

It is an amenable number.

20212000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212000021 is an equidigital number, since it uses as much as digits as its factorization.

20212000021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20212000021 its reverse (12000021202), we get a palindrome (32212021223).

It can be divided in two parts, 202 and 12000021, that multiplied together give a palindrome (2424004242).

The spelling of 20212000021 in words is "twenty billion, two hundred twelve million, twenty-one", and thus it is an aban number.