1021000266 has 96 divisors (see below), whose sum is σ = 2632331520. Its totient is φ = 281923200.

The previous prime is 1021000261. The next prime is 1021000319. The reversal of 1021000266 is 6620001201.

It is a happy number.

1021000266 is a nontrivial binomial coefficient, being equal to C(45189, 2).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1021000261) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 200836 + ... + 205856.

It is an arithmetic number, because the mean of its divisors is an integer number (27420120).

Almost surely, 2^1021000266 is an apocalyptic number.

1021000266 is the 45188-th triangular number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021000266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1316165760).

1021000266 is an abundant number, since it is smaller than the sum of its proper divisors (1611331254).

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

1021000266 is a wasteful number, since it uses less digits than its factorization.

1021000266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5132 (or 5129 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1021000266 is about 31953.0947796923. The cubic root of 1021000266 is about 1006.9516512313.

Adding to 1021000266 its reverse (6620001201), we get a palindrome (7641001467).

The spelling of 1021000266 in words is "one billion, twenty-one million, two hundred sixty-six", and thus it is an aban number.