20678383421 has 2 divisors, whose sum is σ = 20678383422. Its totient is φ = 20678383420.

The previous prime is 20678383409. The next prime is 20678383433. The reversal of 20678383421 is 12438387602.

It is a balanced prime because it is at equal distance from previous prime (20678383409) and next prime (20678383433).

It can be written as a sum of positive squares in only one way, i.e., 16673265625 + 4005117796 = 129125^2 + 63286^2 .

It is a cyclic number.

It is not a de Polignac number, because 20678383421 - 2⁶ = 20678383357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20678383321) 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, 10339191710 + 10339191711.

It is an arithmetic number, because the mean of its divisors is an integer number (10339191711).

Almost surely, 2^20678383421 is an apocalyptic number.

It is an amenable number.

20678383421 is a deficient number, since it is larger than the sum of its proper divisors (1).

20678383421 is an equidigital number, since it uses as much as digits as its factorization.

20678383421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 44.

The spelling of 20678383421 in words is "twenty billion, six hundred seventy-eight million, three hundred eighty-three thousand, four hundred twenty-one".