1220002001001 has 48 divisors (see below), whose sum is σ = 2057092038144. Its totient is φ = 682221578112.

The previous prime is 1220002000999. The next prime is 1220002001011. The reversal of 1220002001001 is 1001002000221.

It is not a de Polignac number, because 1220002001001 - 2¹ = 1220002000999 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 (1220002001011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27138795 + ... + 27183711.

It is an arithmetic number, because the mean of its divisors is an integer number (42856084128).

Almost surely, 2^{1220002001001} is an apocalyptic number.

It is an amenable number.

1220002001001 is a deficient number, since it is larger than the sum of its proper divisors (837090037143).

1220002001001 is a wasteful number, since it uses less digits than its factorization.

1220002001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54150 (or 54147 counting only the distinct ones).

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

Adding to 1220002001001 its reverse (1001002000221), we get a palindrome (2221004001222).

The spelling of 1220002001001 in words is "one trillion, two hundred twenty billion, two million, one thousand, one".