1021121000320 has 128 divisors (see below), whose sum is σ = 2478155834880. Its totient is φ = 402263500800.

The previous prime is 1021121000197. The next prime is 1021121000329. The reversal of 1021121000320 is 230001211201.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 1021121000320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021121000329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44110669 + ... + 44133811.

It is an arithmetic number, because the mean of its divisors is an integer number (19360592460).

Almost surely, 2^{1021121000320} is an apocalyptic number.

1021121000320 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 1021121000320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1239077917440).

1021121000320 is an abundant number, since it is smaller than the sum of its proper divisors (1457034834560).

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

1021121000320 is an equidigital number, since it uses as much as digits as its factorization.

1021121000320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24204 (or 24192 counting only the distinct ones).

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

Adding to 1021121000320 its reverse (230001211201), we get a palindrome (1251122211521).

The spelling of 1021121000320 in words is "one trillion, twenty-one billion, one hundred twenty-one million, three hundred twenty", and thus it is an aban number.