3402520421 has 4 divisors (see below), whose sum is σ = 3436208844. Its totient is φ = 3368832000.

The previous prime is 3402520409. The next prime is 3402520453. The reversal of 3402520421 is 1240252043.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2105800321 + 1296720100 = 45889^2 + 36010^2 .

It is a cyclic number.

It is not a de Polignac number, because 3402520421 - 2⁶ = 3402520357 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 (3402520721) 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, 16844060 + ... + 16844261.

It is an arithmetic number, because the mean of its divisors is an integer number (859052211).

Almost surely, 2^3402520421 is an apocalyptic number.

It is an amenable number.

3402520421 is a deficient number, since it is larger than the sum of its proper divisors (33688423).

3402520421 is a wasteful number, since it uses less digits than its factorization.

3402520421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33688422.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 3402520421 is about 58331.1273763846. The cubic root of 3402520421 is about 1504.0660675116.

Adding to 3402520421 its reverse (1240252043), we get a palindrome (4642772464).

It can be divided in two parts, 340252042 and 1, that added together give a palindrome (340252043).

The spelling of 3402520421 in words is "three billion, four hundred two million, five hundred twenty thousand, four hundred twenty-one".