111212121002220 has 288 divisors, whose sum is σ = 395997987840000. Its totient is φ = 24730217713152.

The previous prime is 111212121002179. The next prime is 111212121002261. The reversal of 111212121002220 is 22200121212111.

111212121002220 is a `hidden beast` number, since 1 + 112 + 121 + 210 + 0 + 2 + 220 = 666.

It is an interprime number because it is at equal distance from previous prime (111212121002179) and next prime (111212121002261).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 111212121002193 and 111212121002202.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 448313781 + ... + 448561779.

Almost surely, 2^{111212121002220} is an apocalyptic number.

111212121002220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111212121002220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197998993920000).

111212121002220 is an abundant number, since it is smaller than the sum of its proper divisors (284785866837780).

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

111212121002220 is a wasteful number, since it uses less digits than its factorization.

111212121002220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257677 (or 257672 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 111212121002220 its reverse (22200121212111), we get a palindrome (133412242214331).

The spelling of 111212121002220 in words is "one hundred eleven trillion, two hundred twelve billion, one hundred twenty-one million, two thousand, two hundred twenty".