1211143000 has 128 divisors (see below), whose sum is σ = 2942334720. Its totient is φ = 466329600.

The previous prime is 1211142997. The next prime is 1211143027. The reversal of 1211143000 is 3411121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3430824 + ... + 3431176.

It is an arithmetic number, because the mean of its divisors is an integer number (22986990).

Almost surely, 2^1211143000 is an apocalyptic number.

1211143000 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 1211143000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1471167360).

1211143000 is an abundant number, since it is smaller than the sum of its proper divisors (1731191720).

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

1211143000 is a wasteful number, since it uses less digits than its factorization.

1211143000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1211143000 is about 34801.4798535924. The cubic root of 1211143000 is about 1065.9376637760.

Adding to 1211143000 its reverse (3411121), we get a palindrome (1214554121).

The spelling of 1211143000 in words is "one billion, two hundred eleven million, one hundred forty-three thousand".