1021143144 has 192 divisors, whose sum is σ = 3263500800. Its totient is φ = 264249216.

The previous prime is 1021143143. The next prime is 1021143169. The reversal of 1021143144 is 4413411201.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 1021143144.

It is not an unprimeable number, because it can be changed into a prime (1021143143) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 512919 + ... + 514905.

It is an arithmetic number, because the mean of its divisors is an integer number (16997400).

Almost surely, 2^1021143144 is an apocalyptic number.

1021143144 is a gapful number since it is divisible by the number (14) 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 1021143144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1631750400).

1021143144 is an abundant number, since it is smaller than the sum of its proper divisors (2242357656).

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

1021143144 is a wasteful number, since it uses less digits than its factorization.

1021143144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052 (or 2041 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 1021143144 is about 31955.3304473604. The cubic root of 1021143144 is about 1006.9986197229.

Adding to 1021143144 its reverse (4413411201), we get a palindrome (5434554345).

The spelling of 1021143144 in words is "one billion, twenty-one million, one hundred forty-three thousand, one hundred forty-four".