21111221210112 has 176 divisors, whose sum is σ = 68204972284800. Its totient is φ = 6397339668480.

The previous prime is 21111221210089. The next prime is 21111221210147. The reversal of 21111221210112 is 21101212211112.

It is a happy number.

21111221210112 is a `hidden beast` number, since 211 + 11 + 221 + 210 + 1 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (176).

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34403662 + ... + 35011917.

Almost surely, 2^{21111221210112} is an apocalyptic number.

21111221210112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21111221210112 is an abundant number, since it is smaller than the sum of its proper divisors (47093751074688).

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

21111221210112 is a wasteful number, since it uses less digits than its factorization.

21111221210112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69415619 (or 69415595 counting only the distinct ones).

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

Adding to 21111221210112 its reverse (21101212211112), we get a palindrome (42212433421224).

The spelling of 21111221210112 in words is "twenty-one trillion, one hundred eleven billion, two hundred twenty-one million, two hundred ten thousand, one hundred twelve".