10111211201220 has 96 divisors (see below), whose sum is σ = 28974062853120. Its totient is φ = 2633229889920.

The previous prime is 10111211201197. The next prime is 10111211201233. The reversal of 10111211201220 is 2210211211101.

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 10111211201220.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17441991 + ... + 18012369.

It is an arithmetic number, because the mean of its divisors is an integer number (301813154720).

Almost surely, 2^{10111211201220} is an apocalyptic number.

10111211201220 is a gapful number since it is divisible by the number (10) 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 10111211201220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14487031426560).

10111211201220 is an abundant number, since it is smaller than the sum of its proper divisors (18862851651900).

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

10111211201220 is a wasteful number, since it uses less digits than its factorization.

10111211201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577305 (or 577303 counting only the distinct ones).

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

Adding to 10111211201220 its reverse (2210211211101), we get a palindrome (12321422412321).

The spelling of 10111211201220 in words is "ten trillion, one hundred eleven billion, two hundred eleven million, two hundred one thousand, two hundred twenty".