1221550026323 has 24 divisors (see below), whose sum is σ = 1349420911104. Its totient is φ = 1104943569840.

The previous prime is 1221550026299. The next prime is 1221550026337. The reversal of 1221550026323 is 3236200551221.

It is not a de Polignac number, because 1221550026323 - 2²² = 1221545832019 is a prime.

It is a super-3 number, since 3×1221550026323³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221550026323.

It is not an unprimeable number, because it can be changed into a prime (1221550026343) 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 23 ways as a sum of consecutive naturals, for example, 48961190 + ... + 48986132.

It is an arithmetic number, because the mean of its divisors is an integer number (56225871296).

Almost surely, 2^{1221550026323} is an apocalyptic number.

1221550026323 is a deficient number, since it is larger than the sum of its proper divisors (127870884781).

1221550026323 is a wasteful number, since it uses less digits than its factorization.

1221550026323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26975 (or 26964 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

Adding to 1221550026323 its reverse (3236200551221), we get a palindrome (4457750577544).

The spelling of 1221550026323 in words is "one trillion, two hundred twenty-one billion, five hundred fifty million, twenty-six thousand, three hundred twenty-three".