221211010101120 has 512 divisors, whose sum is σ = 786398556303360. Its totient is φ = 52523723980800.

The previous prime is 221211010101073. The next prime is 221211010101139. The reversal of 221211010101120 is 21101010112122.

It is a happy number.

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 221211010101120.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 237078700 + ... + 238009940.

It is an arithmetic number, because the mean of its divisors is an integer number (1535934680280).

Almost surely, 2^{221211010101120} is an apocalyptic number.

221211010101120 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 221211010101120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (393199278151680).

221211010101120 is an abundant number, since it is smaller than the sum of its proper divisors (565187546202240).

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

221211010101120 is a wasteful number, since it uses less digits than its factorization.

221211010101120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931614 (or 931602 counting only the distinct ones).

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

Adding to 221211010101120 its reverse (21101010112122), we get a palindrome (242312020213242).

The spelling of 221211010101120 in words is "two hundred twenty-one trillion, two hundred eleven billion, ten million, one hundred one thousand, one hundred twenty".