1040667021 has 10 divisors (see below), whose sum is σ = 1554576782. Its totient is φ = 693777960.

The previous prime is 1040667011. The next prime is 1040667109. The reversal of 1040667021 is 1207660401.

1040667021 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 only one way, i.e., 919908900 + 120758121 = 30330^2 + 10989^2 .

It is not a de Polignac number, because 1040667021 - 2²⁷ = 906449293 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1040667011) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 6423790 + ... + 6423951.

Almost surely, 2^1040667021 is an apocalyptic number.

It is an amenable number.

1040667021 is a deficient number, since it is larger than the sum of its proper divisors (513909761).

1040667021 is an equidigital number, since it uses as much as digits as its factorization.

1040667021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12847753 (or 12847744 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 1040667021 is about 32259.3710571053. The cubic root of 1040667021 is about 1013.3759596445.

The spelling of 1040667021 in words is "one billion, forty million, six hundred sixty-seven thousand, twenty-one".