21211110112112 has 80 divisors (see below), whose sum is σ = 44575563267072. Its totient is φ = 9740755906560.

The previous prime is 21211110112111. The next prime is 21211110112183. The reversal of 21211110112112 is 21121101111212.

It is a super-2 number, since 2×21211110112112² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211110112111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2925863 + ... + 7140230.

Almost surely, 2^{21211110112112} is an apocalyptic number.

It is an amenable number.

21211110112112 is an abundant number, since it is smaller than the sum of its proper divisors (23364453154960).

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

21211110112112 is a wasteful number, since it uses less digits than its factorization.

21211110112112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10066306 (or 10066300 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 21211110112112 its reverse (21121101111212), we get a palindrome (42332211223324).

The spelling of 21211110112112 in words is "twenty-one trillion, two hundred eleven billion, one hundred ten million, one hundred twelve thousand, one hundred twelve".