3506880021 has 16 divisors (see below), whose sum is σ = 4721847168. Its totient is φ = 2315016000.

The previous prime is 3506880011. The next prime is 3506880023. The reversal of 3506880021 is 1200886053.

It is a happy number.

It is not a de Polignac number, because 3506880021 - 2¹⁴ = 3506863637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3506880023) 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, 131391 + ... + 155811.

It is an arithmetic number, because the mean of its divisors is an integer number (295115448).

Almost surely, 2^3506880021 is an apocalyptic number.

It is an amenable number.

3506880021 is a deficient number, since it is larger than the sum of its proper divisors (1214967147).

3506880021 is a wasteful number, since it uses less digits than its factorization.

3506880021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24892.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 3506880021 is about 59218.9160741735. The cubic root of 3506880021 is about 1519.2886822084.

The spelling of 3506880021 in words is "three billion, five hundred six million, eight hundred eighty thousand, twenty-one".