1221111331331 has 8 divisors (see below), whose sum is σ = 1242228510720. Its totient is φ = 1200173872968.

The previous prime is 1221111331309. The next prime is 1221111331351. The reversal of 1221111331331 is 1331331111221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221111331331 is a prime.

It is a super-2 number, since 2×1221111331331² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221111331297 and 1221111331306.

It is not an unprimeable number, because it can be changed into a prime (1221111331351) 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 7 ways as a sum of consecutive naturals, for example, 44916551 + ... + 44943728.

It is an arithmetic number, because the mean of its divisors is an integer number (155278563840).

Almost surely, 2^{1221111331331} is an apocalyptic number.

1221111331331 is a deficient number, since it is larger than the sum of its proper divisors (21117179389).

1221111331331 is a wasteful number, since it uses less digits than its factorization.

1221111331331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89860513.

The product of its digits is 324, while the sum is 23.

Adding to 1221111331331 its reverse (1331331111221), we get a palindrome (2552442442552).

The spelling of 1221111331331 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, three hundred thirty-one thousand, three hundred thirty-one".