21123300100 has 36 divisors (see below), whose sum is σ = 52385785984. Its totient is φ = 7242274080.

The previous prime is 21123300089. The next prime is 21123300127. The reversal of 21123300100 is 100332112.

It is a super-3 number, since 3×21123300100³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 15087372 + ... + 15088771.

Almost surely, 2^21123300100 is an apocalyptic number.

21123300100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21123300100 is an abundant number, since it is smaller than the sum of its proper divisors (31262485884).

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

21123300100 is a wasteful number, since it uses less digits than its factorization.

21123300100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30176164 (or 30176157 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21123300100 its reverse (100332112), we get a palindrome (21223632212).

The spelling of 21123300100 in words is "twenty-one billion, one hundred twenty-three million, three hundred thousand, one hundred".