21101102021100 has 72 divisors (see below), whose sum is σ = 64265812488640. Its totient is φ = 5330804719680.

The previous prime is 21101102021071. The next prime is 21101102021173. The reversal of 21101102021100 is 112020110112.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 1850968162 + ... + 1850979561.

Almost surely, 2^{21101102021100} is an apocalyptic number.

21101102021100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101102021100 is an abundant number, since it is smaller than the sum of its proper divisors (43164710467540).

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

21101102021100 is a wasteful number, since it uses less digits than its factorization.

21101102021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3701947759 (or 3701947752 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21101102021100 its reverse (112020110112), we get a palindrome (21213122131212).

The spelling of 21101102021100 in words is "twenty-one trillion, one hundred one billion, one hundred two million, twenty-one thousand, one hundred".