1021375540 has 24 divisors (see below), whose sum is σ = 2148876072. Its totient is φ = 407790720.

The previous prime is 1021375489. The next prime is 1021375543. The reversal of 1021375540 is 455731201.

It is a happy number.

1021375540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 37675044 + 983700496 = 6138^2 + 31364^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1021375499 and 1021375508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021375543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36379 + ... + 58018.

It is an arithmetic number, because the mean of its divisors is an integer number (89536503).

Almost surely, 2^1021375540 is an apocalyptic number.

1021375540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021375540 is an abundant number, since it is smaller than the sum of its proper divisors (1127500532).

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

1021375540 is a wasteful number, since it uses less digits than its factorization.

1021375540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94947 (or 94945 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 1021375540 is about 31958.9665039406. The cubic root of 1021375540 is about 1007.0750062386.

The spelling of 1021375540 in words is "one billion, twenty-one million, three hundred seventy-five thousand, five hundred forty".