3506420521 has 2 divisors, whose sum is σ = 3506420522. Its totient is φ = 3506420520.

The previous prime is 3506420507. The next prime is 3506420543. The reversal of 3506420521 is 1250246053.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2504001600 + 1002418921 = 50040^2 + 31661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3506420521 is a prime.

It is a super-2 number, since 2×3506420521² = 24589969740179822882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3506420521.

It is not a weakly prime, because it can be changed into another prime (3506421521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1753210260 + 1753210261.

It is an arithmetic number, because the mean of its divisors is an integer number (1753210261).

Almost surely, 2^3506420521 is an apocalyptic number.

It is an amenable number.

3506420521 is a deficient number, since it is larger than the sum of its proper divisors (1).

3506420521 is an equidigital number, since it uses as much as digits as its factorization.

3506420521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 3506420521 is about 59215.0362745815. The cubic root of 3506420521 is about 1519.2223227818. Note that the first 3 decimals are identical.

Adding to 3506420521 its reverse (1250246053), we get a palindrome (4756666574).

The spelling of 3506420521 in words is "three billion, five hundred six million, four hundred twenty thousand, five hundred twenty-one".