20324203432421 has 4 divisors (see below), whose sum is σ = 23227661065632. Its totient is φ = 17420745799212.

The previous prime is 20324203432373. The next prime is 20324203432499. The reversal of 20324203432421 is 12423430242302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20324203432421 - 2³⁰ = 20323129690597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20324203432021) 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, 1451728816595 + ... + 1451728816608.

It is an arithmetic number, because the mean of its divisors is an integer number (5806915266408).

Almost surely, 2^{20324203432421} is an apocalyptic number.

It is an amenable number.

20324203432421 is a deficient number, since it is larger than the sum of its proper divisors (2903457633211).

20324203432421 is an equidigital number, since it uses as much as digits as its factorization.

20324203432421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2903457633210.

The product of its (nonzero) digits is 55296, while the sum is 32.

Adding to 20324203432421 its reverse (12423430242302), we get a palindrome (32747633674723).

The spelling of 20324203432421 in words is "twenty trillion, three hundred twenty-four billion, two hundred three million, four hundred thirty-two thousand, four hundred twenty-one".