1040020221 has 4 divisors (see below), whose sum is σ = 1386693632. Its totient is φ = 693346812.

The previous prime is 1040020213. The next prime is 1040020253. The reversal of 1040020221 is 1220200401.

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 1040020221 - 2³ = 1040020213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1040020197 and 1040020206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1040025221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173336701 + ... + 173336706.

It is an arithmetic number, because the mean of its divisors is an integer number (346673408).

Almost surely, 2^1040020221 is an apocalyptic number.

It is an amenable number.

1040020221 is a deficient number, since it is larger than the sum of its proper divisors (346673411).

1040020221 is an equidigital number, since it uses as much as digits as its factorization.

1040020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346673410.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 1040020221 is about 32249.3445049663. The cubic root of 1040020221 is about 1013.1659701546.

Adding to 1040020221 its reverse (1220200401), we get a palindrome (2260220622).

The spelling of 1040020221 in words is "one billion, forty million, twenty thousand, two hundred twenty-one".