21111220002100 has 72 divisors (see below), whose sum is σ = 47761194650400. Its totient is φ = 8092479857280.

The previous prime is 21111220002083. The next prime is 21111220002203. The reversal of 21111220002100 is 120002211112.

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 23 ways as a sum of consecutive naturals, for example, 46088950 + ... + 46544749.

It is an arithmetic number, because the mean of its divisors is an integer number (663349925700).

Almost surely, 2^{21111220002100} is an apocalyptic number.

21111220002100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111220002100 is an abundant number, since it is smaller than the sum of its proper divisors (26649974648300).

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

21111220002100 is a wasteful number, since it uses less digits than its factorization.

21111220002100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92633809 (or 92633802 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21111220002100 its reverse (120002211112), we get a palindrome (21231222213212).

The spelling of 21111220002100 in words is "twenty-one trillion, one hundred eleven billion, two hundred twenty million, two thousand, one hundred".