21111210112100 has 36 divisors (see below), whose sum is σ = 46876705625904. Its totient is φ = 8248100693280.

The previous prime is 21111210112093. The next prime is 21111210112127. The reversal of 21111210112100 is 121101211112.

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, 2454787574 + ... + 2454796173.

Almost surely, 2^{21111210112100} is an apocalyptic number.

21111210112100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111210112100 is an abundant number, since it is smaller than the sum of its proper divisors (25765495513804).

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

21111210112100 is a wasteful number, since it uses less digits than its factorization.

21111210112100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4909583804 (or 4909583797 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21111210112100 its reverse (121101211112), we get a palindrome (21232311323212).

The spelling of 21111210112100 in words is "twenty-one trillion, one hundred eleven billion, two hundred ten million, one hundred twelve thousand, one hundred".