1220000002001 has 4 divisors (see below), whose sum is σ = 1330909093104. Its totient is φ = 1109090910900.

The previous prime is 1220000001991. The next prime is 1220000002033. The reversal of 1220000002001 is 1002000000221.

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 1220000002001 - 2¹⁰ = 1220000000977 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220000002001.

It is not an unprimeable number, because it can be changed into a prime (1220000002061) 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, 55454545535 + ... + 55454545556.

It is an arithmetic number, because the mean of its divisors is an integer number (332727273276).

Almost surely, 2^{1220000002001} is an apocalyptic number.

1220000002001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220000002001 is a deficient number, since it is larger than the sum of its proper divisors (110909091103).

1220000002001 is a wasteful number, since it uses less digits than its factorization.

1220000002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110909091102.

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

Adding to 1220000002001 its reverse (1002000000221), we get a palindrome (2222000002222).

The spelling of 1220000002001 in words is "one trillion, two hundred twenty billion, two thousand, one".