20341040021 has 4 divisors (see below), whose sum is σ = 20348887212. Its totient is φ = 20333192832.

The previous prime is 20341039997. The next prime is 20341040051. The reversal of 20341040021 is 12004014302.

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 5649175921 + 14691864100 = 75161^2 + 121210^2 .

It is a cyclic number.

It is not a de Polignac number, because 20341040021 - 2²² = 20336845717 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 (20341040051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3919706 + ... + 3924891.

It is an arithmetic number, because the mean of its divisors is an integer number (5087221803).

Almost surely, 2^20341040021 is an apocalyptic number.

It is an amenable number.

20341040021 is a deficient number, since it is larger than the sum of its proper divisors (7847191).

20341040021 is an equidigital number, since it uses as much as digits as its factorization.

20341040021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7847190.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 20341040021 its reverse (12004014302), we get a palindrome (32345054323).

The spelling of 20341040021 in words is "twenty billion, three hundred forty-one million, forty thousand, twenty-one".