2643421919 has 4 divisors (see below), whose sum is σ = 2798917344. Its totient is φ = 2487926496.

The previous prime is 2643421909. The next prime is 2643421933. The reversal of 2643421919 is 9191243462.

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

It is a cyclic number.

It is not a de Polignac number, because 2643421919 - 2¹² = 2643417823 is a prime.

It is a super-2 number, since 2×2643421919² = 13975358883699285122, 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 (2643421909) 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, 77747687 + ... + 77747720.

It is an arithmetic number, because the mean of its divisors is an integer number (699729336).

Almost surely, 2^2643421919 is an apocalyptic number.

2643421919 is a deficient number, since it is larger than the sum of its proper divisors (155495425).

2643421919 is a wasteful number, since it uses less digits than its factorization.

2643421919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155495424.

The product of its digits is 93312, while the sum is 41.

The square root of 2643421919 is about 51414.2190352046. The cubic root of 2643421919 is about 1382.6815323407.

The spelling of 2643421919 in words is "two billion, six hundred forty-three million, four hundred twenty-one thousand, nine hundred nineteen".