1223554553221 has 192 divisors, whose sum is σ = 1737795483648. Its totient is φ = 837568512000.

The previous prime is 1223554553147. The next prime is 1223554553239.

1223554553221 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1223554553221 - 2⁹ = 1223554552709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223554553321) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 4514961316 + ... + 4514961586.

It is an arithmetic number, because the mean of its divisors is an integer number (9051018144).

Almost surely, 2^{1223554553221} is an apocalyptic number.

1223554553221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1223554553221 is a deficient number, since it is larger than the sum of its proper divisors (514240930427).

1223554553221 is a wasteful number, since it uses less digits than its factorization.

1223554553221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564 (or 553 counting only the distinct ones).

The product of its digits is 360000, while the sum is 40.

The spelling of 1223554553221 in words is "one trillion, two hundred twenty-three billion, five hundred fifty-four million, five hundred fifty-three thousand, two hundred twenty-one".