3504021021 has 12 divisors (see below), whose sum is σ = 5327751520. Its totient is φ = 2213065800.

The previous prime is 3504020981. The next prime is 3504021041. The reversal of 3504021021 is 1201204053.

It is not a de Polignac number, because 3504021021 - 2²⁵ = 3470466589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3504020985 and 3504021003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3504021041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10245505 + ... + 10245846.

Almost surely, 2^3504021021 is an apocalyptic number.

It is an amenable number.

3504021021 is a deficient number, since it is larger than the sum of its proper divisors (1823730499).

3504021021 is a wasteful number, since it uses less digits than its factorization.

3504021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20491376 (or 20491373 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 3504021021 is about 59194.7719059716. The cubic root of 3504021021 is about 1518.8757009408.

Adding to 3504021021 its reverse (1201204053), we get a palindrome (4705225074).

The spelling of 3504021021 in words is "three billion, five hundred four million, twenty-one thousand, twenty-one".