1021542533540 has 48 divisors (see below), whose sum is σ = 2161362450240. Its totient is φ = 405547820160.

The previous prime is 1021542533533. The next prime is 1021542533567. The reversal of 1021542533540 is 453352451201.

1021542533540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 1021542533540.

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, 8897339 + ... + 9011421.

It is an arithmetic number, because the mean of its divisors is an integer number (45028384380).

Almost surely, 2^{1021542533540} is an apocalyptic number.

1021542533540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021542533540 is an abundant number, since it is smaller than the sum of its proper divisors (1139819916700).

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

1021542533540 is a wasteful number, since it uses less digits than its factorization.

1021542533540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117452 (or 117450 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 35.

Adding to 1021542533540 its reverse (453352451201), we get a palindrome (1474894984741).

The spelling of 1021542533540 in words is "one trillion, twenty-one billion, five hundred forty-two million, five hundred thirty-three thousand, five hundred forty".