21100123451100 has 36 divisors (see below), whose sum is σ = 61049690519384. Its totient is φ = 5626699586880.

The previous prime is 21100123451087. The next prime is 21100123451131. The reversal of 21100123451100 is 115432100112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35166872119 + ... + 35166872718.

Almost surely, 2^{21100123451100} is an apocalyptic number.

21100123451100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100123451100 is an abundant number, since it is smaller than the sum of its proper divisors (39949567068284).

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

21100123451100 is a wasteful number, since it uses less digits than its factorization.

21100123451100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70333744854 (or 70333744847 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

Adding to 21100123451100 its reverse (115432100112), we get a palindrome (21215555551212).

The spelling of 21100123451100 in words is "twenty-one trillion, one hundred billion, one hundred twenty-three million, four hundred fifty-one thousand, one hundred".