1221043203011 has 4 divisors (see below), whose sum is σ = 1230364143624. Its totient is φ = 1211722262400.

The previous prime is 1221043202917. The next prime is 1221043203019. The reversal of 1221043203011 is 1103023401221.

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 1221043203011 - 2²⁶ = 1220976094147 is a prime.

It is a super-2 number, since 2×1221043203011² (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 (1221043203019) 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, 4660470110 + ... + 4660470371.

It is an arithmetic number, because the mean of its divisors is an integer number (307591035906).

Almost surely, 2^{1221043203011} is an apocalyptic number.

1221043203011 is a deficient number, since it is larger than the sum of its proper divisors (9320940613).

1221043203011 is an equidigital number, since it uses as much as digits as its factorization.

1221043203011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9320940612.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1221043203011 its reverse (1103023401221), we get a palindrome (2324066604232).

The spelling of 1221043203011 in words is "one trillion, two hundred twenty-one billion, forty-three million, two hundred three thousand, eleven".