1021252535240 has 256 divisors, whose sum is σ = 2707926681600. Its totient is φ = 339429888000.

The previous prime is 1021252535221. The next prime is 1021252535249. The reversal of 1021252535240 is 425352521201.

1021252535240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 1021252535197 and 1021252535206.

It is not an unprimeable number, because it can be changed into a prime (1021252535249) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 412292882 + ... + 412295358.

It is an arithmetic number, because the mean of its divisors is an integer number (10577838600).

Almost surely, 2^{1021252535240} is an apocalyptic number.

1021252535240 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 1021252535240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1353963340800).

1021252535240 is an abundant number, since it is smaller than the sum of its proper divisors (1686674146360).

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

1021252535240 is a wasteful number, since it uses less digits than its factorization.

1021252535240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2896 (or 2892 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 32.

The spelling of 1021252535240 in words is "one trillion, twenty-one billion, two hundred fifty-two million, five hundred thirty-five thousand, two hundred forty".