20432421111 has 4 divisors (see below), whose sum is σ = 27243228152. Its totient is φ = 13621614072.

The previous prime is 20432421073. The next prime is 20432421127. The reversal of 20432421111 is 11112423402.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20432421111 - 2²² = 20428226807 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 (20432421181) 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 3 ways as a sum of consecutive naturals, for example, 3405403516 + ... + 3405403521.

It is an arithmetic number, because the mean of its divisors is an integer number (6810807038).

Almost surely, 2^20432421111 is an apocalyptic number.

20432421111 is a deficient number, since it is larger than the sum of its proper divisors (6810807041).

20432421111 is an equidigital number, since it uses as much as digits as its factorization.

20432421111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6810807040.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 20432421111 its reverse (11112423402), we get a palindrome (31544844513).

The spelling of 20432421111 in words is "twenty billion, four hundred thirty-two million, four hundred twenty-one thousand, one hundred eleven".