21112222200111 has 24 divisors (see below), whose sum is σ = 35793866213664. Its totient is φ = 11738069484480.

The previous prime is 21112222200067. The next prime is 21112222200127. The reversal of 21112222200111 is 11100222221112.

21112222200111 is a `hidden beast` number, since 2 + 111 + 222 + 220 + 0 + 111 = 666.

It is not a de Polignac number, because 21112222200111 - 2¹⁴ = 21112222183727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112222200151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4528573860 + ... + 4528578521.

It is an arithmetic number, because the mean of its divisors is an integer number (1491411092236).

Almost surely, 2^{21112222200111} is an apocalyptic number.

21112222200111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21112222200111 is a deficient number, since it is larger than the sum of its proper divisors (14681644013553).

21112222200111 is a wasteful number, since it uses less digits than its factorization.

21112222200111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9057152431 (or 9057152428 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21112222200111 its reverse (11100222221112), we get a palindrome (32212444421223).

The spelling of 21112222200111 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-two million, two hundred thousand, one hundred eleven".