4021323421 has 2 divisors, whose sum is σ = 4021323422. Its totient is φ = 4021323420.

The previous prime is 4021323409. The next prime is 4021323433. The reversal of 4021323421 is 1243231204.

It is a balanced prime because it is at equal distance from previous prime (4021323409) and next prime (4021323433).

It can be written as a sum of positive squares in only one way, i.e., 2702544196 + 1318779225 = 51986^2 + 36315^2 .

It is a cyclic number.

It is not a de Polignac number, because 4021323421 - 2⁹ = 4021322909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4021323392 and 4021323401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4021303421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010661710 + 2010661711.

It is an arithmetic number, because the mean of its divisors is an integer number (2010661711).

Almost surely, 2^4021323421 is an apocalyptic number.

It is an amenable number.

4021323421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021323421 is an equidigital number, since it uses as much as digits as its factorization.

4021323421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 4021323421 is about 63413.9055807163. The cubic root of 4021323421 is about 1590.2167895272.

Adding to 4021323421 its reverse (1243231204), we get a palindrome (5264554625).

The spelling of 4021323421 in words is "four billion, twenty-one million, three hundred twenty-three thousand, four hundred twenty-one".