221111111002100 has 72 divisors (see below), whose sum is σ = 554220320629248. Its totient is φ = 75674390924800.

The previous prime is 221111111002099. The next prime is 221111111002129. The reversal of 221111111002100 is 1200111111122.

221111111002100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 5912043092 + ... + 5912080491.

It is an arithmetic number, because the mean of its divisors is an integer number (7697504453184).

Almost surely, 2^{221111111002100} is an apocalyptic number.

221111111002100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221111111002100 is an abundant number, since it is smaller than the sum of its proper divisors (333109209627148).

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

221111111002100 is a wasteful number, since it uses less digits than its factorization.

221111111002100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11824123625 (or 11824123618 counting only the distinct ones).

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

Adding to 221111111002100 its reverse (1200111111122), we get a palindrome (222311222113222).

The spelling of 221111111002100 in words is "two hundred twenty-one trillion, one hundred eleven billion, one hundred eleven million, two thousand, one hundred".