1221013113333 has 16 divisors (see below), whose sum is σ = 1758216331200. Its totient is φ = 749264085504.

The previous prime is 1221013113233. The next prime is 1221013113361. The reversal of 1221013113333 is 3333113101221.

It is not a de Polignac number, because 1221013113333 - 2²⁰ = 1221012064757 is a prime.

It is a super-2 number, since 2×1221013113333² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221013113233) 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, 44331883 + ... + 44359416.

It is an arithmetic number, because the mean of its divisors is an integer number (109888520700).

Almost surely, 2^{1221013113333} is an apocalyptic number.

1221013113333 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1221013113333 is a deficient number, since it is larger than the sum of its proper divisors (537203217867).

1221013113333 is a wasteful number, since it uses less digits than its factorization.

1221013113333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88691668.

The product of its (nonzero) digits is 972, while the sum is 24.

Adding to 1221013113333 its reverse (3333113101221), we get a palindrome (4554126214554).

The spelling of 1221013113333 in words is "one trillion, two hundred twenty-one billion, thirteen million, one hundred thirteen thousand, three hundred thirty-three".