21220111010112 has 112 divisors (see below), whose sum is σ = 64977796546560. Its totient is φ = 5986143401472.

The previous prime is 21220111010101. The next prime is 21220111010123. The reversal of 21220111010112 is 21101011102212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21220111010101) and next prime (21220111010123).

It is a tau number, because it is divible by the number of its divisors (112).

It is a super-2 number, since 2×21220111010112² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21220111010091 and 21220111010100.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 99822768 + ... + 100035119.

Almost surely, 2^{21220111010112} is an apocalyptic number.

It is an amenable number.

21220111010112 is an abundant number, since it is smaller than the sum of its proper divisors (43757685536448).

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

21220111010112 is a wasteful number, since it uses less digits than its factorization.

21220111010112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199857988 (or 199857978 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21220111010112 its reverse (21101011102212), we get a palindrome (42321122112324).

The spelling of 21220111010112 in words is "twenty-one trillion, two hundred twenty billion, one hundred eleven million, ten thousand, one hundred twelve".