3020872321 has 4 divisors (see below), whose sum is σ = 3022143444. Its totient is φ = 3019601200.

The previous prime is 3020872259. The next prime is 3020872397. The reversal of 3020872321 is 1232780203.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1232780203 = 661 ⋅1865023.

It can be written as a sum of positive squares in 2 ways, for example, as 1259895025 + 1760977296 = 35495^2 + 41964^2 .

It is a cyclic number.

It is not a de Polignac number, because 3020872321 - 2⁷ = 3020872193 is a prime.

It is a super-4 number, since 4×3020872321⁴ (a number of 39 digits) contains 4444 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3020872321.

It is not an unprimeable number, because it can be changed into a prime (3020872021) 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, 631990 + ... + 636751.

It is an arithmetic number, because the mean of its divisors is an integer number (755535861).

Almost surely, 2^3020872321 is an apocalyptic number.

It is an amenable number.

3020872321 is a deficient number, since it is larger than the sum of its proper divisors (1271123).

3020872321 is a wasteful number, since it uses less digits than its factorization.

3020872321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271122.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 3020872321 is about 54962.4628360120. The cubic root of 3020872321 is about 1445.5866315403.

The spelling of 3020872321 in words is "three billion, twenty million, eight hundred seventy-two thousand, three hundred twenty-one".