21103101122100 has 72 divisors (see below), whose sum is σ = 61060730800608. Its totient is φ = 5627270140800.

The previous prime is 21103101122099. The next prime is 21103101122143. The reversal of 21103101122100 is 122110130112.

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 21103101122100.

It is a congruent number.

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, 6239182 + ... + 9007418.

It is an arithmetic number, because the mean of its divisors is an integer number (848065705564).

Almost surely, 2^{21103101122100} is an apocalyptic number.

21103101122100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21103101122100 is an abundant number, since it is smaller than the sum of its proper divisors (39957629678508).

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

21103101122100 is a wasteful number, since it uses less digits than its factorization.

21103101122100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2793665 (or 2793658 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21103101122100 its reverse (122110130112), we get a palindrome (21225211252212).

The spelling of 21103101122100 in words is "twenty-one trillion, one hundred three billion, one hundred one million, one hundred twenty-two thousand, one hundred".