111212122202120 has 32 divisors (see below), whose sum is σ = 250246475642520. Its totient is φ = 44481435425280.

The previous prime is 111212122202107. The next prime is 111212122202123. The reversal of 111212122202120 is 21202221212111.

It can be written as a sum of positive squares in 4 ways, for example, as 106554873341764 + 4657248860356 = 10322542^2 + 2158066^2 .

It is a super-2 number, since 2×111212122202120² (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 = 111212122202092 and 111212122202101.

It is not an unprimeable number, because it can be changed into a prime (111212122202123) 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, 106142651 + ... + 107185290.

Almost surely, 2^{111212122202120} is an apocalyptic number.

111212122202120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111212122202120 is an abundant number, since it is smaller than the sum of its proper divisors (139034353440400).

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

111212122202120 is a wasteful number, since it uses less digits than its factorization.

111212122202120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213340985 (or 213340981 counting only the distinct ones).

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

Adding to 111212122202120 its reverse (21202221212111), we get a palindrome (132414343414231).

Subtracting from 111212122202120 its reverse (21202221212111), we obtain a palindrome (90009900990009).

The spelling of 111212122202120 in words is "one hundred eleven trillion, two hundred twelve billion, one hundred twenty-two million, two hundred two thousand, one hundred twenty".