211222444220 has 96 divisors (see below), whose sum is σ = 483901278336. Its totient is φ = 77143449600.

The previous prime is 211222444207. The next prime is 211222444243. The reversal of 211222444220 is 22444222112.

It is a super-2 number, since 2×211222444220² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211222444220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1444265 + ... + 1583775.

It is an arithmetic number, because the mean of its divisors is an integer number (5040638316).

Almost surely, 2^211222444220 is an apocalyptic number.

211222444220 is a gapful number since it is divisible by the number (20) 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 211222444220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241950639168).

211222444220 is an abundant number, since it is smaller than the sum of its proper divisors (272678834116).

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

211222444220 is a wasteful number, since it uses less digits than its factorization.

211222444220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139671 (or 139669 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 26.

Adding to 211222444220 its reverse (22444222112), we get a palindrome (233666666332).

The spelling of 211222444220 in words is "two hundred eleven billion, two hundred twenty-two million, four hundred forty-four thousand, two hundred twenty".