20213421061 has 2 divisors, whose sum is σ = 20213421062. Its totient is φ = 20213421060.

The previous prime is 20213420999. The next prime is 20213421079. The reversal of 20213421061 is 16012431202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15853328100 + 4360092961 = 125910^2 + 66031^2 .

It is a cyclic number.

It is not a de Polignac number, because 20213421061 - 2⁷ = 20213420933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20213421461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106710530 + 10106710531.

It is an arithmetic number, because the mean of its divisors is an integer number (10106710531).

Almost surely, 2^20213421061 is an apocalyptic number.

It is an amenable number.

20213421061 is a deficient number, since it is larger than the sum of its proper divisors (1).

20213421061 is an equidigital number, since it uses as much as digits as its factorization.

20213421061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 20213421061 its reverse (16012431202), we get a palindrome (36225852263).

The spelling of 20213421061 in words is "twenty billion, two hundred thirteen million, four hundred twenty-one thousand, sixty-one".