1222001001 has 48 divisors (see below), whose sum is σ = 1928908800. Its totient is φ = 741018240.

The previous prime is 1222000999. The next prime is 1222001009. The reversal of 1222001001 is 1001002221.

It is not a de Polignac number, because 1222001001 - 2¹ = 1222000999 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 (1222001009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3329520 + ... + 3329886.

It is an arithmetic number, because the mean of its divisors is an integer number (40185600).

Almost surely, 2^1222001001 is an apocalyptic number.

It is an amenable number.

1222001001 is a deficient number, since it is larger than the sum of its proper divisors (706907799).

1222001001 is a wasteful number, since it uses less digits than its factorization.

1222001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726 (or 723 counting only the distinct ones).

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

The square root of 1222001001 is about 34957.1309034366. The cubic root of 1222001001 is about 1069.1135993186.

Adding to 1222001001 its reverse (1001002221), we get a palindrome (2223003222).

It can be divided in two parts, 122200 and 1001, that added together give a square (123201 = 351²).

The spelling of 1222001001 in words is "one billion, two hundred twenty-two million, one thousand, one".