221111112002220 has 144 divisors (see below), whose sum is σ = 751451818729248. Its totient is φ = 52153972346880.

The previous prime is 221111112002219. The next prime is 221111112002393. The reversal of 221111112002220 is 22200211111122.

221111112002220 is a `hidden beast` number, since 2 + 211 + 111 + 120 + 0 + 2 + 220 = 666.

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 = 221111112002193 and 221111112002202.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1509011589 + ... + 1509158108.

It is an arithmetic number, because the mean of its divisors is an integer number (5218415407842).

Almost surely, 2^{221111112002220} is an apocalyptic number.

221111112002220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221111112002220 is an abundant number, since it is smaller than the sum of its proper divisors (530340706727028).

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

221111112002220 is a wasteful number, since it uses less digits than its factorization.

221111112002220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3018169760 (or 3018169755 counting only the distinct ones).

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

Adding to 221111112002220 its reverse (22200211111122), we get a palindrome (243311323113342).

The spelling of 221111112002220 in words is "two hundred twenty-one trillion, one hundred eleven billion, one hundred twelve million, two thousand, two hundred twenty".