21121110210112 has 28 divisors (see below), whose sum is σ = 45722403354096. Its totient is φ = 9600504640640.

The previous prime is 21121110210107. The next prime is 21121110210113. The reversal of 21121110210112 is 21101201112112.

It is a super-2 number, since 2×21121110210112² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (21121110210113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15000787798 + ... + 15000789205.

It is an arithmetic number, because the mean of its divisors is an integer number (1632942976932).

Almost surely, 2^{21121110210112} is an apocalyptic number.

21121110210112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21121110210112 is an abundant number, since it is smaller than the sum of its proper divisors (24601293143984).

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

21121110210112 is a wasteful number, since it uses less digits than its factorization.

21121110210112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30001577026 (or 30001577016 counting only the distinct ones).

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

Adding to 21121110210112 its reverse (21101201112112), we get a palindrome (42222311322224).

The spelling of 21121110210112 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred ten million, two hundred ten thousand, one hundred twelve".