1040661021 has 8 divisors (see below), whose sum is σ = 1391741344. Its totient is φ = 691677360.

The previous prime is 1040660993. The next prime is 1040661029. The reversal of 1040661021 is 1201660401.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1040661021 - 2¹¹ = 1040658973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1040661029) 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, 523006 + ... + 524991.

It is an arithmetic number, because the mean of its divisors is an integer number (173967668).

Almost surely, 2^1040661021 is an apocalyptic number.

It is an amenable number.

1040661021 is a deficient number, since it is larger than the sum of its proper divisors (351080323).

1040661021 is a wasteful number, since it uses less digits than its factorization.

1040661021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048331.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1040661021 is about 32259.2780607378. The cubic root of 1040661021 is about 1013.3740120900.

The spelling of 1040661021 in words is "one billion, forty million, six hundred sixty-one thousand, twenty-one".