1011201220 has 12 divisors (see below), whose sum is σ = 2123522604. Its totient is φ = 404480480.

The previous prime is 1011201211. The next prime is 1011201227. The reversal of 1011201220 is 221021101.

It can be written as a sum of positive squares in 2 ways, for example, as 751088836 + 260112384 = 27406^2 + 16128^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1011201197 and 1011201206.

It is not an unprimeable number, because it can be changed into a prime (1011201227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25280011 + ... + 25280050.

It is an arithmetic number, because the mean of its divisors is an integer number (176960217).

Almost surely, 2^1011201220 is an apocalyptic number.

1011201220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011201220 is an abundant number, since it is smaller than the sum of its proper divisors (1112321384).

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

1011201220 is a wasteful number, since it uses less digits than its factorization.

1011201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50560070 (or 50560068 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1011201220 is about 31799.3902457264. The cubic root of 1011201220 is about 1003.7198852954.

Adding to 1011201220 its reverse (221021101), we get a palindrome (1232222321).

The spelling of 1011201220 in words is "one billion, eleven million, two hundred one thousand, two hundred twenty".