1020021040 has 40 divisors (see below), whose sum is σ = 2416305168. Its totient is φ = 400308480.

The previous prime is 1020020983. The next prime is 1020021127. The reversal of 1020021040 is 401200201.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116046 + ... + 124525.

Almost surely, 2^1020021040 is an apocalyptic number.

1020021040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020021040 is an abundant number, since it is smaller than the sum of its proper divisors (1396284128).

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

1020021040 is a wasteful number, since it uses less digits than its factorization.

1020021040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240637 (or 240631 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1020021040 is about 31937.7682376211. The cubic root of 1020021040 is about 1006.6296308661.

Adding to 1020021040 its reverse (401200201), we get a palindrome (1421221241).

The spelling of 1020021040 in words is "one billion, twenty million, twenty-one thousand, forty".