1143211320 has 320 divisors, whose sum is σ = 4155624000. Its totient is φ = 281546496.

The previous prime is 1143211313. The next prime is 1143211337. The reversal of 1143211320 is 231123411.

It is a super-2 number, since 2×1143211320² = 2613864244352284800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1143211293 and 1143211302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 39421066 + ... + 39421094.

It is an arithmetic number, because the mean of its divisors is an integer number (12986325).

Almost surely, 2^1143211320 is an apocalyptic number.

1143211320 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 1143211320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2077812000).

1143211320 is an abundant number, since it is smaller than the sum of its proper divisors (3012412680).

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

1143211320 is an equidigital number, since it uses as much as digits as its factorization.

1143211320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121 (or 62 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1143211320 is about 33811.4081339420. The cubic root of 1143211320 is about 1045.6239095312.

Adding to 1143211320 its reverse (231123411), we get a palindrome (1374334731).

The spelling of 1143211320 in words is "one billion, one hundred forty-three million, two hundred eleven thousand, three hundred twenty".