4025424021 has 4 divisors (see below), whose sum is σ = 5367232032. Its totient is φ = 2683616012.

The previous prime is 4025424017. The next prime is 4025424089. The reversal of 4025424021 is 1204245204.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4025424021 - 2² = 4025424017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4025423982 and 4025424000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4025424001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 670904001 + ... + 670904006.

It is an arithmetic number, because the mean of its divisors is an integer number (1341808008).

Almost surely, 2^4025424021 is an apocalyptic number.

It is an amenable number.

4025424021 is a deficient number, since it is larger than the sum of its proper divisors (1341808011).

4025424021 is a wasteful number, since it uses less digits than its factorization.

4025424021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341808010.

The product of its (nonzero) digits is 2560, while the sum is 24.

The square root of 4025424021 is about 63446.2293678671. The cubic root of 4025424021 is about 1590.7571280405.

Adding to 4025424021 its reverse (1204245204), we get a palindrome (5229669225).

The spelling of 4025424021 in words is "four billion, twenty-five million, four hundred twenty-four thousand, twenty-one".