21230221100 has 36 divisors (see below), whose sum is σ = 50257726008. Its totient is φ = 7720080000.

The previous prime is 21230221091. The next prime is 21230221147. The reversal of 21230221100 is 112203212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9649001 + ... + 9651200.

Almost surely, 2^21230221100 is an apocalyptic number.

21230221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21230221100 is an abundant number, since it is smaller than the sum of its proper divisors (29027504908).

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

21230221100 is a wasteful number, since it uses less digits than its factorization.

21230221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19300226 (or 19300219 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21230221100 its reverse (112203212), we get a palindrome (21342424312).

The spelling of 21230221100 in words is "twenty-one billion, two hundred thirty million, two hundred twenty-one thousand, one hundred".