1005140221 has 4 divisors (see below), whose sum is σ = 1007764992. Its totient is φ = 1002515452.

The previous prime is 1005140197. The next prime is 1005140233. The reversal of 1005140221 is 1220415001.

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 a cyclic number.

It is not a de Polignac number, because 1005140221 - 2¹⁷ = 1005009149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1005140195 and 1005140204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005140281) 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, 1311811 + ... + 1312576.

It is an arithmetic number, because the mean of its divisors is an integer number (251941248).

Almost surely, 2^1005140221 is an apocalyptic number.

It is an amenable number.

1005140221 is a deficient number, since it is larger than the sum of its proper divisors (2624771).

1005140221 is an equidigital number, since it uses as much as digits as its factorization.

1005140221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2624770.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 1005140221 is about 31703.9464578150. The cubic root of 1005140221 is about 1001.7104795914.

Adding to 1005140221 its reverse (1220415001), we get a palindrome (2225555222).

The spelling of 1005140221 in words is "one billion, five million, one hundred forty thousand, two hundred twenty-one".