1121323220 has 12 divisors (see below), whose sum is σ = 2354778804. Its totient is φ = 448529280.

The previous prime is 1121323211. The next prime is 1121323223. The reversal of 1121323220 is 223231211.

It can be written as a sum of positive squares in 2 ways, for example, as 777517456 + 343805764 = 27884^2 + 18542^2 .

It is a super-2 number, since 2×1121323220² = 2514731527422336800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121323223) 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, 28033061 + ... + 28033100.

It is an arithmetic number, because the mean of its divisors is an integer number (196231567).

Almost surely, 2^1121323220 is an apocalyptic number.

1121323220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121323220 is an abundant number, since it is smaller than the sum of its proper divisors (1233455584).

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

1121323220 is a wasteful number, since it uses less digits than its factorization.

1121323220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56066170 (or 56066168 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1121323220 is about 33486.1646056995. The cubic root of 1121323220 is about 1038.9076363219.

Adding to 1121323220 its reverse (223231211), we get a palindrome (1344554431).

The spelling of 1121323220 in words is "one billion, one hundred twenty-one million, three hundred twenty-three thousand, two hundred twenty".