1021350023440 has 80 divisors (see below), whose sum is σ = 2417225466240. Its totient is φ = 401274086400.

The previous prime is 1021350023423. The next prime is 1021350023443. The reversal of 1021350023440 is 443200531201.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (1021350023443) 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, 600127 + ... + 1550113.

It is an arithmetic number, because the mean of its divisors is an integer number (30215318328).

Almost surely, 2^{1021350023440} is an apocalyptic number.

1021350023440 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 1021350023440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1208612733120).

1021350023440 is an abundant number, since it is smaller than the sum of its proper divisors (1395875442800).

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

1021350023440 is a wasteful number, since it uses less digits than its factorization.

1021350023440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950240 (or 950234 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 1021350023440 its reverse (443200531201), we get a palindrome (1464550554641).

The spelling of 1021350023440 in words is "one trillion, twenty-one billion, three hundred fifty million, twenty-three thousand, four hundred forty".