4025040421 has 2 divisors, whose sum is σ = 4025040422. Its totient is φ = 4025040420.

The previous prime is 4025040407. The next prime is 4025040463. The reversal of 4025040421 is 1240405204.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3523728321 + 501312100 = 59361^2 + 22390^2 .

It is a cyclic number.

It is not a de Polignac number, because 4025040421 - 2¹¹ = 4025038373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4025040392 and 4025040401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4025040401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2012520210 + 2012520211.

It is an arithmetic number, because the mean of its divisors is an integer number (2012520211).

Almost surely, 2^4025040421 is an apocalyptic number.

It is an amenable number.

4025040421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4025040421 is an equidigital number, since it uses as much as digits as its factorization.

4025040421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 4025040421 is about 63443.2062635551. The cubic root of 4025040421 is about 1590.7065964016.

Adding to 4025040421 its reverse (1240405204), we get a palindrome (5265445625).

The spelling of 4025040421 in words is "four billion, twenty-five million, forty thousand, four hundred twenty-one".