20183405021 has 8 divisors (see below), whose sum is σ = 22323433944. Its totient is φ = 18127298880.

The previous prime is 20183404999. The next prime is 20183405041. The reversal of 20183405021 is 12050438102.

It can be written as a sum of positive squares in 4 ways, for example, as 2297284900 + 17886120121 = 47930^2 + 133739^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20183405021 - 2²² = 20179210717 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 (20183405041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20980190 + ... + 20981151.

It is an arithmetic number, because the mean of its divisors is an integer number (2790429243).

Almost surely, 2^20183405021 is an apocalyptic number.

It is an amenable number.

20183405021 is a deficient number, since it is larger than the sum of its proper divisors (2140028923).

20183405021 is a wasteful number, since it uses less digits than its factorization.

20183405021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41961391.

The product of its (nonzero) digits is 1920, while the sum is 26.

The spelling of 20183405021 in words is "twenty billion, one hundred eighty-three million, four hundred five thousand, twenty-one".