1221221101101 has 8 divisors (see below), whose sum is σ = 1662939371904. Its totient is φ = 796825115520.

The previous prime is 1221221101043. The next prime is 1221221101109. The reversal of 1221221101101 is 1011011221221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221221101101 - 2³⁵ = 1186861362733 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221221101109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4330571140 + ... + 4330571421.

It is an arithmetic number, because the mean of its divisors is an integer number (207867421488).

Almost surely, 2^{1221221101101} is an apocalyptic number.

It is an amenable number.

1221221101101 is a deficient number, since it is larger than the sum of its proper divisors (441718270803).

1221221101101 is an equidigital number, since it uses as much as digits as its factorization.

1221221101101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8661142611.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1221221101101 its reverse (1011011221221), we get a palindrome (2232232322322).

It can be divided in two parts, 1221221 and 101101, that multiplied together give a palindrome (123466664321).

The spelling of 1221221101101 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred one thousand, one hundred one".