1021135836 has 48 divisors (see below), whose sum is σ = 2733212160. Its totient is φ = 290662080.

The previous prime is 1021135823. The next prime is 1021135903. The reversal of 1021135836 is 6385311201.

1021135836 is a nontrivial binomial coefficient, being equal to C(45192, 2).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1 + ... + 45191.

It is an arithmetic number, because the mean of its divisors is an integer number (56941920).

Almost surely, 2^1021135836 is an apocalyptic number.

1021135836 is the 45191-st triangular number and also the 22596-th hexagonal number.

It is an amenable number.

1021135836 is an abundant number, since it is smaller than the sum of its proper divisors (1712076324).

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

1021135836 is a wasteful number, since it uses less digits than its factorization.

1021135836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45474 (or 45472 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 1021135836 is about 31955.2161000360. The cubic root of 1021135836 is about 1006.9962174598.

The spelling of 1021135836 in words is "one billion, twenty-one million, one hundred thirty-five thousand, eight hundred thirty-six".