1220221121011 has 4 divisors (see below), whose sum is σ = 1220799153024. Its totient is φ = 1219643089000.

The previous prime is 1220221120999. The next prime is 1220221121069. The reversal of 1220221121011 is 1101211220221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1220221121011 - 2²⁷ = 1220086903283 is a prime.

It is a super-2 number, since 2×1220221121011² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220221121311) 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, 289012840 + ... + 289017061.

It is an arithmetic number, because the mean of its divisors is an integer number (305199788256).

Almost surely, 2^{1220221121011} is an apocalyptic number.

1220221121011 is a deficient number, since it is larger than the sum of its proper divisors (578032013).

1220221121011 is an equidigital number, since it uses as much as digits as its factorization.

1220221121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578032012.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1220221121011 its reverse (1101211220221), we get a palindrome (2321432341232).

The spelling of 1220221121011 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, one hundred twenty-one thousand, eleven".