4020403421 has 2 divisors, whose sum is σ = 4020403422. Its totient is φ = 4020403420.

The previous prime is 4020403417. The next prime is 4020403441. The reversal of 4020403421 is 1243040204.

It is an a-pointer prime, because the next prime (4020403441) can be obtained adding 4020403421 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2290675321 + 1729728100 = 47861^2 + 41590^2 .

It is a cyclic number.

It is not a de Polignac number, because 4020403421 - 2² = 4020403417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4020403393 and 4020403402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4020403411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010201710 + 2010201711.

It is an arithmetic number, because the mean of its divisors is an integer number (2010201711).

Almost surely, 2^4020403421 is an apocalyptic number.

It is an amenable number.

4020403421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4020403421 is an equidigital number, since it uses as much as digits as its factorization.

4020403421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 4020403421 is about 63406.6512362859. The cubic root of 4020403421 is about 1590.0955101310.

Adding to 4020403421 its reverse (1243040204), we get a palindrome (5263443625).

The spelling of 4020403421 in words is "four billion, twenty million, four hundred three thousand, four hundred twenty-one".