3621752921 has 4 divisors (see below), whose sum is σ = 3622455012. Its totient is φ = 3621050832.

The previous prime is 3621752903. The next prime is 3621752929. The reversal of 3621752921 is 1292571263.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1292571263 = 15319 ⋅84377.

It can be written as a sum of positive squares in 2 ways, for example, as 868127296 + 2753625625 = 29464^2 + 52475^2 .

It is a cyclic number.

It is not a de Polignac number, because 3621752921 - 2¹⁴ = 3621736537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3621752929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343250 + ... + 353643.

It is an arithmetic number, because the mean of its divisors is an integer number (905613753).

Almost surely, 2^3621752921 is an apocalyptic number.

It is an amenable number.

3621752921 is a deficient number, since it is larger than the sum of its proper divisors (702091).

3621752921 is an equidigital number, since it uses as much as digits as its factorization.

3621752921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702090.

The product of its digits is 45360, while the sum is 38.

The square root of 3621752921 is about 60181.0013293232. The cubic root of 3621752921 is about 1535.6996066085.

The spelling of 3621752921 in words is "three billion, six hundred twenty-one million, seven hundred fifty-two thousand, nine hundred twenty-one".