21330220100 has 72 divisors (see below), whose sum is σ = 52930362240. Its totient is φ = 7308875520.

The previous prime is 21330220073. The next prime is 21330220117. The reversal of 21330220100 is 102203312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

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, 1307192 + ... + 1323408.

It is an arithmetic number, because the mean of its divisors is an integer number (735143920).

Almost surely, 2^21330220100 is an apocalyptic number.

21330220100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21330220100 is an abundant number, since it is smaller than the sum of its proper divisors (31600142140).

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

21330220100 is a wasteful number, since it uses less digits than its factorization.

21330220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18117 (or 18110 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21330220100 its reverse (102203312), we get a palindrome (21432423412).

The spelling of 21330220100 in words is "twenty-one billion, three hundred thirty million, two hundred twenty thousand, one hundred".