21300121100 has 36 divisors (see below), whose sum is σ = 48940164504. Its totient is φ = 8018868480.

The previous prime is 21300121091. The next prime is 21300121127. The reversal of 21300121100 is 112100312.

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, 6263042 + ... + 6266441.

It is an arithmetic number, because the mean of its divisors is an integer number (1359449014).

Almost surely, 2^21300121100 is an apocalyptic number.

21300121100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21300121100 is an abundant number, since it is smaller than the sum of its proper divisors (27640043404).

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

21300121100 is a wasteful number, since it uses less digits than its factorization.

21300121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12529514 (or 12529507 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21300121100 its reverse (112100312), we get a palindrome (21412221412).

The spelling of 21300121100 in words is "twenty-one billion, three hundred million, one hundred twenty-one thousand, one hundred".