1221133332221 has 16 divisors (see below), whose sum is σ = 1335808417920. Its totient is φ = 1107070398720.

The previous prime is 1221133332151. The next prime is 1221133332253. The reversal of 1221133332221 is 1222333311221.

It is not a de Polignac number, because 1221133332221 - 2¹⁴ = 1221133315837 is a prime.

It is a super-2 number, since 2×1221133332221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221133332421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15405536 + ... + 15484598.

It is an arithmetic number, because the mean of its divisors is an integer number (83488026120).

Almost surely, 2^{1221133332221} is an apocalyptic number.

1221133332221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1221133332221 is a deficient number, since it is larger than the sum of its proper divisors (114675085699).

1221133332221 is a wasteful number, since it uses less digits than its factorization.

1221133332221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82916.

The product of its digits is 2592, while the sum is 26.

Adding to 1221133332221 its reverse (1222333311221), we get a palindrome (2443466643442).

The spelling of 1221133332221 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-three million, three hundred thirty-two thousand, two hundred twenty-one".