2421840397 has 4 divisors (see below), whose sum is σ = 2422109116. Its totient is φ = 2421571680.

The previous prime is 2421840391. The next prime is 2421840403. The reversal of 2421840397 is 7930481242.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7930481242 = 2 ⋅3965240621.

It is an interprime number because it is at equal distance from previous prime (2421840391) and next prime (2421840403).

It can be written as a sum of positive squares in 2 ways, for example, as 2280444516 + 141395881 = 47754^2 + 11891^2 .

It is a cyclic number.

It is not a de Polignac number, because 2421840397 - 2³ = 2421840389 is a prime.

It is a super-2 number, since 2×2421840397² = 11730621817082235218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2421840391) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 120354 + ... + 139027.

It is an arithmetic number, because the mean of its divisors is an integer number (605527279).

Almost surely, 2^2421840397 is an apocalyptic number.

It is an amenable number.

2421840397 is a deficient number, since it is larger than the sum of its proper divisors (268719).

2421840397 is an equidigital number, since it uses as much as digits as its factorization.

2421840397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268718.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 2421840397 is about 49212.1976444865. The cubic root of 2421840397 is about 1342.9149429577.

The spelling of 2421840397 in words is "two billion, four hundred twenty-one million, eight hundred forty thousand, three hundred ninety-seven".