1011020111220 has 384 divisors, whose sum is σ = 3408411525120. Its totient is φ = 218924259840.

The previous prime is 1011020111209. The next prime is 1011020111221. The reversal of 1011020111220 is 221110201101.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1011020111196 and 1011020111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011020111221) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 863381235 + ... + 863382405.

It is an arithmetic number, because the mean of its divisors is an integer number (8876071680).

Almost surely, 2^{1011020111220} is an apocalyptic number.

1011020111220 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 1011020111220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1704205762560).

1011020111220 is an abundant number, since it is smaller than the sum of its proper divisors (2397391413900).

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

1011020111220 is a wasteful number, since it uses less digits than its factorization.

1011020111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1995 (or 1993 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1011020111220 its reverse (221110201101), we get a palindrome (1232130312321).

The spelling of 1011020111220 in words is "one trillion, eleven billion, twenty million, one hundred eleven thousand, two hundred twenty".