1021200320 has 112 divisors (see below), whose sum is σ = 2826593280. Its totient is φ = 344146944.

The previous prime is 1021200307. The next prime is 1021200331. The reversal of 1021200320 is 230021201.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128297 + ... + 136023.

It is an arithmetic number, because the mean of its divisors is an integer number (25237440).

Almost surely, 2^1021200320 is an apocalyptic number.

1021200320 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 1021200320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1413296640).

1021200320 is an abundant number, since it is smaller than the sum of its proper divisors (1805392960).

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

1021200320 is an equidigital number, since it uses as much as digits as its factorization.

1021200320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7810 (or 7800 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1021200320 is about 31956.2250586642. The cubic root of 1021200320 is about 1007.0174140447.

Adding to 1021200320 its reverse (230021201), we get a palindrome (1251221521).

The spelling of 1021200320 in words is "one billion, twenty-one million, two hundred thousand, three hundred twenty".