1040641221 has 4 divisors (see below), whose sum is σ = 1387521632. Its totient is φ = 693760812.

The previous prime is 1040641211. The next prime is 1040641289. The reversal of 1040641221 is 1221460401.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1040641221 - 2¹⁰ = 1040640197 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 (1040641211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173440201 + ... + 173440206.

It is an arithmetic number, because the mean of its divisors is an integer number (346880408).

Almost surely, 2^1040641221 is an apocalyptic number.

It is an amenable number.

1040641221 is a deficient number, since it is larger than the sum of its proper divisors (346880411).

1040641221 is an equidigital number, since it uses as much as digits as its factorization.

1040641221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346880410.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 1040641221 is about 32258.9711708232. The cubic root of 1040641221 is about 1013.3675851068.

The spelling of 1040641221 in words is "one billion, forty million, six hundred forty-one thousand, two hundred twenty-one".