21330320100 has 72 divisors (see below), whose sum is σ = 61741339968. Its totient is φ = 5685724800.

The previous prime is 21330320041. The next prime is 21330320107. The reversal of 21330320100 is 102303312.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21330320100.

It is not an unprimeable number, because it can be changed into a prime (21330320107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 780670 + ... + 807530.

Almost surely, 2^21330320100 is an apocalyptic number.

21330320100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21330320100 is an abundant number, since it is smaller than the sum of its proper divisors (40411019868).

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

21330320100 is a wasteful number, since it uses less digits than its factorization.

21330320100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29525 (or 29518 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 21330320100 its reverse (102303312), we get a palindrome (21432623412).

The spelling of 21330320100 in words is "twenty-one billion, three hundred thirty million, three hundred twenty thousand, one hundred".