1220221111001 has 4 divisors (see below), whose sum is σ = 1237407323904. Its totient is φ = 1203034898100.

The previous prime is 1220221110991. The next prime is 1220221111007. The reversal of 1220221111001 is 1001111220221.

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 a de Polignac number, because none of the positive numbers 2^k-1220221111001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220221111007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8593106345 + ... + 8593106486.

It is an arithmetic number, because the mean of its divisors is an integer number (309351830976).

Almost surely, 2^{1220221111001} is an apocalyptic number.

It is an amenable number.

1220221111001 is a deficient number, since it is larger than the sum of its proper divisors (17186212903).

1220221111001 is an equidigital number, since it uses as much as digits as its factorization.

1220221111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17186212902.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1220221111001 its reverse (1001111220221), we get a palindrome (2221332331222).

The spelling of 1220221111001 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, one hundred eleven thousand, one".