21112212211110 has 48 divisors (see below), whose sum is σ = 56375312615856. Its totient is φ = 5477763167424.

The previous prime is 21112212211093. The next prime is 21112212211121. The reversal of 21112212211110 is 1111221221112.

It is a happy number.

21112212211110 is a `hidden beast` number, since 2 + 111 + 221 + 221 + 1 + 110 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 3169998504 + ... + 3170005163.

It is an arithmetic number, because the mean of its divisors is an integer number (1174485679497).

Almost surely, 2^{21112212211110} is an apocalyptic number.

21112212211110 is an abundant number, since it is smaller than the sum of its proper divisors (35263100404746).

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

21112212211110 is a wasteful number, since it uses less digits than its factorization.

21112212211110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6340003717 (or 6340003714 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21112212211110 its reverse (1111221221112), we get a palindrome (22223433432222).

The spelling of 21112212211110 in words is "twenty-one trillion, one hundred twelve billion, two hundred twelve million, two hundred eleven thousand, one hundred ten".