20343025421 has 4 divisors (see below), whose sum is σ = 20351543100. Its totient is φ = 20334507744.

The previous prime is 20343025337. The next prime is 20343025427. The reversal of 20343025421 is 12452034302.

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 14523624196 + 5819401225 = 120514^2 + 76285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20343025421 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 (20343025427) 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, 4255256 + ... + 4260033.

It is an arithmetic number, because the mean of its divisors is an integer number (5087885775).

Almost surely, 2^20343025421 is an apocalyptic number.

It is an amenable number.

20343025421 is a deficient number, since it is larger than the sum of its proper divisors (8517679).

20343025421 is an equidigital number, since it uses as much as digits as its factorization.

20343025421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8517678.

The product of its (nonzero) digits is 5760, while the sum is 26.

Adding to 20343025421 its reverse (12452034302), we get a palindrome (32795059723).

The spelling of 20343025421 in words is "twenty billion, three hundred forty-three million, twenty-five thousand, four hundred twenty-one".