21233221100 has 72 divisors (see below), whose sum is σ = 56709057888. Its totient is φ = 6719961600.

The previous prime is 21233221063. The next prime is 21233221123. The reversal of 21233221100 is 112233212.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1157561 + ... + 1175760.

It is an arithmetic number, because the mean of its divisors is an integer number (787625804).

Almost surely, 2^21233221100 is an apocalyptic number.

21233221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21233221100 is an abundant number, since it is smaller than the sum of its proper divisors (35475836788).

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

21233221100 is a wasteful number, since it uses less digits than its factorization.

21233221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2333355 (or 2333348 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21233221100 its reverse (112233212), we get a palindrome (21345454312).

It can be divided in two parts, 2123 and 3221100, that added together give a palindrome (3223223).

The spelling of 21233221100 in words is "twenty-one billion, two hundred thirty-three million, two hundred twenty-one thousand, one hundred".