3105021 has 4 divisors (see below), whose sum is σ = 4140032. Its totient is φ = 2070012.

The previous prime is 3105007. The next prime is 3105041. The reversal of 3105021 is 1205013.

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: 1205013 = 3 ⋅401671.

It is not a de Polignac number, because 3105021 - 2⁶ = 3104957 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3104988 and 3105006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3105041) 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, 517501 + ... + 517506.

It is an arithmetic number, because the mean of its divisors is an integer number (1035008).

Almost surely, 2^3105021 is an apocalyptic number.

It is an amenable number.

3105021 is a deficient number, since it is larger than the sum of its proper divisors (1035011).

3105021 is a wasteful number, since it uses less digits than its factorization.

3105021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035010.

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 3105021 is about 1762.1069774562. The cubic root of 3105021 is about 145.8886528269. Note that the first 3 decimals are identical.

The spelling of 3105021 in words is "three million, one hundred five thousand, twenty-one".