1011212220 has 96 divisors (see below), whose sum is σ = 2920067136. Its totient is φ = 261273600.

The previous prime is 1011212177. The next prime is 1011212231. The reversal of 1011212220 is 222121101.

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 = 1011212196 and 1011212205.

It is a congruent number.

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, 623010 + ... + 624630.

It is an arithmetic number, because the mean of its divisors is an integer number (30417366).

Almost surely, 2^1011212220 is an apocalyptic number.

1011212220 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 1011212220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1460033568).

1011212220 is an abundant number, since it is smaller than the sum of its proper divisors (1908854916).

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

1011212220 is a wasteful number, since it uses less digits than its factorization.

1011212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1951 (or 1949 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1011212220 is about 31799.5632045473. The cubic root of 1011212220 is about 1003.7235248211.

Adding to 1011212220 its reverse (222121101), we get a palindrome (1233333321).

The spelling of 1011212220 in words is "one billion, eleven million, two hundred twelve thousand, two hundred twenty".