21100003300 has 18 divisors (see below), whose sum is σ = 45787007378. Its totient is φ = 8440001280.

The previous prime is 21100003289. The next prime is 21100003349. The reversal of 21100003300 is 330000112.

It can be written as a sum of positive squares in 3 ways, for example, as 142229476 + 20957773824 = 11926^2 + 144768^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105499917 + ... + 105500116.

Almost surely, 2^21100003300 is an apocalyptic number.

21100003300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100003300 is an abundant number, since it is smaller than the sum of its proper divisors (24687004078).

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

21100003300 is a wasteful number, since it uses less digits than its factorization.

21100003300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211000047 (or 211000040 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 10.

Adding to 21100003300 its reverse (330000112), we get a palindrome (21430003412).

The spelling of 21100003300 in words is "twenty-one billion, one hundred million, three thousand, three hundred".