21112111112010 has 16 divisors (see below), whose sum is σ = 50669066668896. Its totient is φ = 5629896296528.

The previous prime is 21112111111991. The next prime is 21112111112017. The reversal of 21112111112010 is 1021111121112.

It is a super-2 number, since 2×21112111112010² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (21112111112017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351868518504 + ... + 351868518563.

It is an arithmetic number, because the mean of its divisors is an integer number (3166816666806).

Almost surely, 2^{21112111112010} is an apocalyptic number.

21112111112010 is an abundant number, since it is smaller than the sum of its proper divisors (29556955556886).

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

21112111112010 is a wasteful number, since it uses less digits than its factorization.

21112111112010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703737037077.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21112111112010 its reverse (1021111121112), we get a palindrome (22133222233122).

The spelling of 21112111112010 in words is "twenty-one trillion, one hundred twelve billion, one hundred eleven million, one hundred twelve thousand, ten".