21234205106 has 16 divisors (see below), whose sum is σ = 32974608384. Its totient is φ = 10248858144.

The previous prime is 21234205063. The next prime is 21234205127. The reversal of 21234205106 is 60150243212.

It is a happy 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, 1540370 + ... + 1554093.

It is an arithmetic number, because the mean of its divisors is an integer number (2060913024).

Almost surely, 2^21234205106 is an apocalyptic number.

21234205106 is a deficient number, since it is larger than the sum of its proper divisors (11740403278).

21234205106 is a wasteful number, since it uses less digits than its factorization.

21234205106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3094585.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21234205106 its reverse (60150243212), we get a palindrome (81384448318).

The spelling of 21234205106 in words is "twenty-one billion, two hundred thirty-four million, two hundred five thousand, one hundred six".