20403010421 has 2 divisors, whose sum is σ = 20403010422. Its totient is φ = 20403010420.

The previous prime is 20403010387. The next prime is 20403010423. The reversal of 20403010421 is 12401030402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18810122500 + 1592887921 = 137150^2 + 39911^2 .

It is a cyclic number.

It is not a de Polignac number, because 20403010421 - 2²² = 20398816117 is a prime.

Together with 20403010423, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20403010421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20403010423) 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, 10201505210 + 10201505211.

It is an arithmetic number, because the mean of its divisors is an integer number (10201505211).

Almost surely, 2^20403010421 is an apocalyptic number.

It is an amenable number.

20403010421 is a deficient number, since it is larger than the sum of its proper divisors (1).

20403010421 is an equidigital number, since it uses as much as digits as its factorization.

20403010421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 20403010421 its reverse (12401030402), we get a palindrome (32804040823).

The spelling of 20403010421 in words is "twenty billion, four hundred three million, ten thousand, four hundred twenty-one".