1021203253440 has 224 divisors, whose sum is σ = 3617659008000. Its totient is φ = 271180901376.

The previous prime is 1021203253417. The next prime is 1021203253487. The reversal of 1021203253440 is 443523021201.

1021203253440 is a `hidden beast` number, since 1 + 0 + 2 + 120 + 3 + 2 + 534 + 4 + 0 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1817691 + ... + 2312229.

Almost surely, 2^{1021203253440} is an apocalyptic number.

1021203253440 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 1021203253440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1808829504000).

1021203253440 is an abundant number, since it is smaller than the sum of its proper divisors (2596455754560).

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

1021203253440 is a wasteful number, since it uses less digits than its factorization.

1021203253440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494804 (or 494788 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 1021203253440 its reverse (443523021201), we get a palindrome (1464726274641).

The spelling of 1021203253440 in words is "one trillion, twenty-one billion, two hundred three million, two hundred fifty-three thousand, four hundred forty".