3121021145 has 8 divisors (see below), whose sum is σ = 4085700480. Its totient is φ = 2269833520.

The previous prime is 3121021139. The next prime is 3121021157. The reversal of 3121021145 is 5411201213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3121021145 - 2⁴ = 3121021129 is a prime.

It is a super-2 number, since 2×3121021145² = 19481545975074222050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28372865 + ... + 28372974.

It is an arithmetic number, because the mean of its divisors is an integer number (510712560).

Almost surely, 2^3121021145 is an apocalyptic number.

It is an amenable number.

3121021145 is a deficient number, since it is larger than the sum of its proper divisors (964679335).

3121021145 is a wasteful number, since it uses less digits than its factorization.

3121021145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56745855.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 3121021145 is about 55866.1001413200. The cubic root of 3121021145 is about 1461.3881126373.

Adding to 3121021145 its reverse (5411201213), we get a palindrome (8532222358).

The spelling of 3121021145 in words is "three billion, one hundred twenty-one million, twenty-one thousand, one hundred forty-five".