21232421206 has 16 divisors (see below), whose sum is σ = 32388774048. Its totient is φ = 10437011200.

The previous prime is 21232421123. The next prime is 21232421237. The reversal of 21232421206 is 60212423212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161665 + ... + 261916.

It is an arithmetic number, because the mean of its divisors is an integer number (2024298378).

Almost surely, 2^21232421206 is an apocalyptic number.

21232421206 is a deficient number, since it is larger than the sum of its proper divisors (11156352842).

21232421206 is a wasteful number, since it uses less digits than its factorization.

21232421206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424007.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21232421206 its reverse (60212423212), we get a palindrome (81444844418).

The spelling of 21232421206 in words is "twenty-one billion, two hundred thirty-two million, four hundred twenty-one thousand, two hundred six".