1040243021 has 8 divisors (see below), whose sum is σ = 1102361400. Its totient is φ = 979874560.

The previous prime is 1040243003. The next prime is 1040243023. The reversal of 1040243021 is 1203420401.

It can be written as a sum of positive squares in 4 ways, for example, as 29702500 + 1010540521 = 5450^2 + 31789^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1040243021 - 2¹⁴ = 1040226637 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 (1040243023) 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, 436256 + ... + 438633.

It is an arithmetic number, because the mean of its divisors is an integer number (137795175).

Almost surely, 2^1040243021 is an apocalyptic number.

It is an amenable number.

1040243021 is a deficient number, since it is larger than the sum of its proper divisors (62118379).

1040243021 is an equidigital number, since it uses as much as digits as its factorization.

1040243021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874959.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1040243021 is about 32252.7986537603. The cubic root of 1040243021 is about 1013.2383140239.

Adding to 1040243021 its reverse (1203420401), we get a palindrome (2243663422).

The spelling of 1040243021 in words is "one billion, forty million, two hundred forty-three thousand, twenty-one".