1001265221 has 8 divisors (see below), whose sum is σ = 1092520224. Its totient is φ = 910048720.

The previous prime is 1001265193. The next prime is 1001265227. The reversal of 1001265221 is 1225621001.

1001265221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1001265221 - 2⁶ = 1001265157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001265193 and 1001265202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001265227) 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, 86831 + ... + 97683.

It is an arithmetic number, because the mean of its divisors is an integer number (136565028).

Almost surely, 2^1001265221 is an apocalyptic number.

1001265221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1001265221 is a deficient number, since it is larger than the sum of its proper divisors (91255003).

1001265221 is a wasteful number, since it uses less digits than its factorization.

1001265221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19251.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1001265221 is about 31642.7751785459. The cubic root of 1001265221 is about 1000.4215625933.

Adding to 1001265221 its reverse (1225621001), we get a palindrome (2226886222).

The spelling of 1001265221 in words is "one billion, one million, two hundred sixty-five thousand, two hundred twenty-one".