211110121220 has 24 divisors (see below), whose sum is σ = 447720677208. Its totient is φ = 83607968000.

The previous prime is 211110121217. The next prime is 211110121279. The reversal of 211110121220 is 22121011112.

It can be written as a sum of positive squares in 4 ways, for example, as 28309408516 + 182800712704 = 168254^2 + 427552^2 .

It is a junction number, because it is equal to n+sod(n) for n = 211110121195 and 211110121204.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52252961 + ... + 52257000.

It is an arithmetic number, because the mean of its divisors is an integer number (18655028217).

Almost surely, 2^211110121220 is an apocalyptic number.

211110121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211110121220 is an abundant number, since it is smaller than the sum of its proper divisors (236610555988).

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

211110121220 is a wasteful number, since it uses less digits than its factorization.

211110121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104510071 (or 104510069 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 211110121220 its reverse (22121011112), we get a palindrome (233231132332).

The spelling of 211110121220 in words is "two hundred eleven billion, one hundred ten million, one hundred twenty-one thousand, two hundred twenty".