3566121421 has 4 divisors (see below), whose sum is σ = 3570188572. Its totient is φ = 3562054272.

The previous prime is 3566121389. The next prime is 3566121439. The reversal of 3566121421 is 1241216653.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1241216653 = 5867 ⋅211559.

It can be written as a sum of positive squares in 2 ways, for example, as 1805060196 + 1761061225 = 42486^2 + 41965^2 .

It is a cyclic number.

It is not a de Polignac number, because 3566121421 - 2⁵ = 3566121389 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 (3566121121) 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 3 ways as a sum of consecutive naturals, for example, 2032260 + ... + 2034013.

It is an arithmetic number, because the mean of its divisors is an integer number (892547143).

Almost surely, 2^3566121421 is an apocalyptic number.

It is an amenable number.

3566121421 is a deficient number, since it is larger than the sum of its proper divisors (4067151).

3566121421 is an equidigital number, since it uses as much as digits as its factorization.

3566121421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4067150.

The product of its digits is 8640, while the sum is 31.

The square root of 3566121421 is about 59717.0111526021. The cubic root of 3566121421 is about 1527.7960237128.

The spelling of 3566121421 in words is "three billion, five hundred sixty-six million, one hundred twenty-one thousand, four hundred twenty-one".