40203421 has 2 divisors, whose sum is σ = 40203422. Its totient is φ = 40203420.

The previous prime is 40203403. The next prime is 40203433. The reversal of 40203421 is 12430204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38068900 + 2134521 = 6170^2 + 1461^2 .

It is a cyclic number.

It is not a de Polignac number, because 40203421 - 2⁵ = 40203389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40203395 and 40203404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40203481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20101710 + 20101711.

It is an arithmetic number, because the mean of its divisors is an integer number (20101711).

Almost surely, 2^40203421 is an apocalyptic number.

It is an amenable number.

40203421 is a deficient number, since it is larger than the sum of its proper divisors (1).

40203421 is an equidigital number, since it uses as much as digits as its factorization.

40203421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 40203421 is about 6340.6167681070. The cubic root of 40203421 is about 342.5739510340.

Adding to 40203421 its reverse (12430204), we get a palindrome (52633625).

The spelling of 40203421 in words is "forty million, two hundred three thousand, four hundred twenty-one".