1040213221 has 8 divisors (see below), whose sum is σ = 1113779160. Its totient is φ = 968022528.

The previous prime is 1040213219. The next prime is 1040213243. The reversal of 1040213221 is 1223120401.

It can be written as a sum of positive squares in 4 ways, for example, as 40768225 + 999444996 = 6385^2 + 31614^2 .

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 1040213221 - 2¹ = 1040213219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1040213195 and 1040213204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1040213201) by changing a digit.

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, 342246 + ... + 345271.

It is an arithmetic number, because the mean of its divisors is an integer number (139222395).

Almost surely, 2^1040213221 is an apocalyptic number.

It is an amenable number.

1040213221 is a deficient number, since it is larger than the sum of its proper divisors (73565939).

1040213221 is an equidigital number, since it uses as much as digits as its factorization.

1040213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687623.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1040213221 is about 32252.3366750380. The cubic root of 1040213221 is about 1013.2286384675.

Adding to 1040213221 its reverse (1223120401), we get a palindrome (2263333622).

The spelling of 1040213221 in words is "one billion, forty million, two hundred thirteen thousand, two hundred twenty-one".