1221000213223 has 32 divisors (see below), whose sum is σ = 1470993408000. Its totient is φ = 990058606560.

The previous prime is 1221000213203. The next prime is 1221000213229. The reversal of 1221000213223 is 3223120001221.

It is a cyclic number.

It is not a de Polignac number, because 1221000213223 - 2¹⁷ = 1221000082151 is a prime.

It is a super-2 number, since 2×1221000213223² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

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 1221000213223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221000213229) 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 31 ways as a sum of consecutive naturals, for example, 496542168 + ... + 496544626.

It is an arithmetic number, because the mean of its divisors is an integer number (45968544000).

Almost surely, 2^{1221000213223} is an apocalyptic number.

1221000213223 is a deficient number, since it is larger than the sum of its proper divisors (249993194777).

1221000213223 is a wasteful number, since it uses less digits than its factorization.

1221000213223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6355.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 1221000213223 its reverse (3223120001221), we get a palindrome (4444120214444).

The spelling of 1221000213223 in words is "one trillion, two hundred twenty-one billion, two hundred thirteen thousand, two hundred twenty-three".