3499820521 has 4 divisors (see below), whose sum is σ = 3532529232. Its totient is φ = 3467111812.

The previous prime is 3499820459. The next prime is 3499820561. The reversal of 3499820521 is 1250289943.

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: 1250289943 = 7 ⋅178612849.

It is a cyclic number.

It is not a de Polignac number, because 3499820521 - 2¹¹ = 3499818473 is a prime.

It is a super-2 number, since 2×3499820521² = 24497487358425422882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3499820561) 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, 16354195 + ... + 16354408.

It is an arithmetic number, because the mean of its divisors is an integer number (883132308).

Almost surely, 2^3499820521 is an apocalyptic number.

It is an amenable number.

3499820521 is a deficient number, since it is larger than the sum of its proper divisors (32708711).

3499820521 is a wasteful number, since it uses less digits than its factorization.

3499820521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32708710.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 3499820521 is about 59159.2809371446. The cubic root of 3499820521 is about 1518.2685329251.

The spelling of 3499820521 in words is "three billion, four hundred ninety-nine million, eight hundred twenty thousand, five hundred twenty-one".