21234236100 has 144 divisors (see below), whose sum is σ = 76597764096. Its totient is φ = 4412304000.

The previous prime is 21234236071. The next prime is 21234236117. The reversal of 21234236100 is 163243212.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 436516 + ... + 482715.

Almost surely, 2^21234236100 is an apocalyptic number.

21234236100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21234236100 is an abundant number, since it is smaller than the sum of its proper divisors (55363527996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21234236100 is a wasteful number, since it uses less digits than its factorization.

21234236100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919266 (or 919259 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21234236100 its reverse (163243212), we get a palindrome (21397479312).

The spelling of 21234236100 in words is "twenty-one billion, two hundred thirty-four million, two hundred thirty-six thousand, one hundred".