211211100011220 has 48 divisors (see below), whose sum is σ = 591391711370880. Its totient is φ = 56322899875456.

The previous prime is 211211100011147. The next prime is 211211100011291. The reversal of 211211100011220 is 22110001112112.

It is a happy number.

It is a super-2 number, since 2×211211100011220² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 211211100011220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105628849 + ... + 107609831.

It is an arithmetic number, because the mean of its divisors is an integer number (12320660653560).

Almost surely, 2^{211211100011220} is an apocalyptic number.

211211100011220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211211100011220 is an abundant number, since it is smaller than the sum of its proper divisors (380180611359660).

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

211211100011220 is a wasteful number, since it uses less digits than its factorization.

211211100011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3757984 (or 3757982 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 211211100011220 its reverse (22110001112112), we get a palindrome (233321101123332).

The spelling of 211211100011220 in words is "two hundred eleven trillion, two hundred eleven billion, one hundred million, eleven thousand, two hundred twenty".