3256642421 has 4 divisors (see below), whose sum is σ = 3269617344. Its totient is φ = 3243667500.

The previous prime is 3256642397. The next prime is 3256642429. The reversal of 3256642421 is 1242466523.

3256642421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1242466523 = 3217 ⋅386219.

It is a cyclic number.

It is not a de Polignac number, because 3256642421 - 2²² = 3252448117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3256642429) 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, 6487085 + ... + 6487586.

It is an arithmetic number, because the mean of its divisors is an integer number (817404336).

Almost surely, 2^3256642421 is an apocalyptic number.

It is an amenable number.

3256642421 is a deficient number, since it is larger than the sum of its proper divisors (12974923).

3256642421 is a wasteful number, since it uses less digits than its factorization.

3256642421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12974922.

The product of its digits is 69120, while the sum is 35.

The square root of 3256642421 is about 57066.9994042091. Note that the first 3 decimals coincide. The cubic root of 3256642421 is about 1482.2564831827.

The spelling of 3256642421 in words is "three billion, two hundred fifty-six million, six hundred forty-two thousand, four hundred twenty-one".