1001222001 has 24 divisors (see below), whose sum is σ = 1566190080. Its totient is φ = 612681696.

The previous prime is 1001221999. The next prime is 1001222017. The reversal of 1001222001 is 1002221001.

It is not a de Polignac number, because 1001222001 - 2¹ = 1001221999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1001222041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2961 + ... + 44846.

It is an arithmetic number, because the mean of its divisors is an integer number (65257920).

Almost surely, 2^1001222001 is an apocalyptic number.

It is an amenable number.

1001222001 is a deficient number, since it is larger than the sum of its proper divisors (564968079).

1001222001 is a wasteful number, since it uses less digits than its factorization.

1001222001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48005 (or 48002 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1001222001 is about 31642.0922348697. The cubic root of 1001222001 is about 1000.4071678585.

Adding to 1001222001 its reverse (1002221001), we get a palindrome (2003443002).

The spelling of 1001222001 in words is "one billion, one million, two hundred twenty-two thousand, one".