211100212220220 has 36 divisors (see below), whose sum is σ = 640337310401880. Its totient is φ = 56293389925344.

The previous prime is 211100212220197. The next prime is 211100212220221. The reversal of 211100212220220 is 22022212001112.

It is a happy number.

211100212220220 is a `hidden beast` number, since 2 + 1 + 1 + 10 + 0 + 212 + 220 + 220 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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 = 211100212220193 and 211100212220202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211100212220221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 586389478210 + ... + 586389478569.

Almost surely, 2^{211100212220220} is an apocalyptic number.

211100212220220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211100212220220 is an abundant number, since it is smaller than the sum of its proper divisors (429237098181660).

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

211100212220220 is a wasteful number, since it uses less digits than its factorization.

211100212220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172778956794 (or 1172778956789 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 211100212220220 its reverse (22022212001112), we get a palindrome (233122424221332).

The spelling of 211100212220220 in words is "two hundred eleven trillion, one hundred billion, two hundred twelve million, two hundred twenty thousand, two hundred twenty".