3401256521 has 16 divisors (see below), whose sum is σ = 3880800000. Its totient is φ = 2953075968.

The previous prime is 3401256511. The next prime is 3401256533. The reversal of 3401256521 is 1256521043.

3401256521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 3401256521 - 2⁶ = 3401256457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3401256511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 437930 + ... + 445628.

It is an arithmetic number, because the mean of its divisors is an integer number (242550000).

Almost surely, 2^3401256521 is an apocalyptic number.

It is an amenable number.

3401256521 is a deficient number, since it is larger than the sum of its proper divisors (479543479).

3401256521 is a wasteful number, since it uses less digits than its factorization.

3401256521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9728.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 3401256521 is about 58320.2925318452. The cubic root of 3401256521 is about 1503.8798110217.

Adding to 3401256521 its reverse (1256521043), we get a palindrome (4657777564).

The spelling of 3401256521 in words is "three billion, four hundred one million, two hundred fifty-six thousand, five hundred twenty-one".