111221012212220 has 24 divisors (see below), whose sum is σ = 243719087631264. Its totient is φ = 42554126411456.

The previous prime is 111221012212127. The next prime is 111221012212229. The reversal of 111221012212220 is 22212210122111.

It is a super-2 number, since 2×111221012212220² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 111221012212192 and 111221012212201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221012212229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120892404119 + ... + 120892405038.

It is an arithmetic number, because the mean of its divisors is an integer number (10154961984636).

Almost surely, 2^{111221012212220} is an apocalyptic number.

111221012212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111221012212220 is an abundant number, since it is smaller than the sum of its proper divisors (132498075419044).

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

111221012212220 is a wasteful number, since it uses less digits than its factorization.

111221012212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241784809189 (or 241784809187 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 111221012212220 its reverse (22212210122111), we get a palindrome (133433222334331).

The spelling of 111221012212220 in words is "one hundred eleven trillion, two hundred twenty-one billion, twelve million, two hundred twelve thousand, two hundred twenty".