3097978021 has 4 divisors (see below), whose sum is σ = 3098166700. Its totient is φ = 3097789344.

The previous prime is 3097978001. The next prime is 3097978033. The reversal of 3097978021 is 1208797903.

It is a happy number.

3097978021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1473484996 + 1624493025 = 38386^2 + 40305^2 .

It is a cyclic number.

It is not a de Polignac number, because 3097978021 - 2¹⁷ = 3097846949 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 (3097978001) 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, 67086 + ... + 103423.

It is an arithmetic number, because the mean of its divisors is an integer number (774541675).

Almost surely, 2^3097978021 is an apocalyptic number.

It is an amenable number.

3097978021 is a deficient number, since it is larger than the sum of its proper divisors (188679).

3097978021 is a wasteful number, since it uses less digits than its factorization.

3097978021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188678.

The product of its (nonzero) digits is 190512, while the sum is 46.

The square root of 3097978021 is about 55659.4827590052. The cubic root of 3097978021 is about 1457.7826510657.

The spelling of 3097978021 in words is "three billion, ninety-seven million, nine hundred seventy-eight thousand, twenty-one".