211211102122220 has 12 divisors (see below), whose sum is σ = 443543314456704. Its totient is φ = 84484440848880.

The previous prime is 211211102122187. The next prime is 211211102122247. The reversal of 211211102122220 is 22221201112112.

It is a super-3 number, since 3×211211102122220³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 10560555106111 = 211211102122220 / (2 + 1 + 1 + 2 + 1 + 1 + 1 + 0 + 2 + 1 + 2 + 2 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 211211102122192 and 211211102122201.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5280277553036 + ... + 5280277553075.

It is an arithmetic number, because the mean of its divisors is an integer number (36961942871392).

Almost surely, 2^{211211102122220} is an apocalyptic number.

211211102122220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211211102122220 is an abundant number, since it is smaller than the sum of its proper divisors (232332212334484).

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

211211102122220 is a wasteful number, since it uses less digits than its factorization.

211211102122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10560555106120 (or 10560555106118 counting only the distinct ones).

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

Adding to 211211102122220 its reverse (22221201112112), we get a palindrome (233432303234332).

The spelling of 211211102122220 in words is "two hundred eleven trillion, two hundred eleven billion, one hundred two million, one hundred twenty-two thousand, two hundred twenty".