1221113102231 has 16 divisors (see below), whose sum is σ = 1335842070048. Its totient is φ = 1107005568000.

The previous prime is 1221113102227. The next prime is 1221113102243. The reversal of 1221113102231 is 1322013111221.

It is a cyclic number.

It is not a de Polignac number, because 1221113102231 - 2² = 1221113102227 is a prime.

It is a super-2 number, since 2×1221113102231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221113102291) 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 15 ways as a sum of consecutive naturals, for example, 15474131 + ... + 15552843.

It is an arithmetic number, because the mean of its divisors is an integer number (83490129378).

Almost surely, 2^{1221113102231} is an apocalyptic number.

1221113102231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221113102231 is a deficient number, since it is larger than the sum of its proper divisors (114728967817).

1221113102231 is a wasteful number, since it uses less digits than its factorization.

1221113102231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82642.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1221113102231 its reverse (1322013111221), we get a palindrome (2543126213452).

The spelling of 1221113102231 in words is "one trillion, two hundred twenty-one billion, one hundred thirteen million, one hundred two thousand, two hundred thirty-one".