1021749120 has 256 divisors, whose sum is σ = 4136140800. Its totient is φ = 233515008.

The previous prime is 1021749109. The next prime is 1021749167. The reversal of 1021749120 is 219471201.

1021749120 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 116737 + ... + 125183.

It is an arithmetic number, because the mean of its divisors is an integer number (16156800).

Almost surely, 2^1021749120 is an apocalyptic number.

1021749120 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 1021749120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2068070400).

1021749120 is an abundant number, since it is smaller than the sum of its proper divisors (3114391680).

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

1021749120 is an equidigital number, since it uses as much as digits as its factorization.

1021749120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8482 (or 8464 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 1021749120 is about 31964.8106517151. The cubic root of 1021749120 is about 1007.1977744096.

The spelling of 1021749120 in words is "one billion, twenty-one million, seven hundred forty-nine thousand, one hundred twenty".