20421323611432 has 32 divisors (see below), whose sum is σ = 39750291914400. Its totient is φ = 9823734051264.

The previous prime is 20421323611393. The next prime is 20421323611433. The reversal of 20421323611432 is 23411632312402.

It is not an unprimeable number, because it can be changed into a prime (20421323611433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155451918 + ... + 155583229.

It is an arithmetic number, because the mean of its divisors is an integer number (1242196622325).

Almost surely, 2^{20421323611432} is an apocalyptic number.

It is an amenable number.

20421323611432 is a deficient number, since it is larger than the sum of its proper divisors (19328968302968).

20421323611432 is a wasteful number, since it uses less digits than its factorization.

20421323611432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311035465 (or 311035461 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

Adding to 20421323611432 its reverse (23411632312402), we get a palindrome (43832955923834).

The spelling of 20421323611432 in words is "twenty trillion, four hundred twenty-one billion, three hundred twenty-three million, six hundred eleven thousand, four hundred thirty-two".