1221421033223 has 4 divisors (see below), whose sum is σ = 1236882059040. Its totient is φ = 1205960007408.

The previous prime is 1221421033219. The next prime is 1221421033271. The reversal of 1221421033223 is 3223301241221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221421033223 - 2² = 1221421033219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221421033192 and 1221421033201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221421033213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7730512790 + ... + 7730512947.

It is an arithmetic number, because the mean of its divisors is an integer number (309220514760).

Almost surely, 2^{1221421033223} is an apocalyptic number.

1221421033223 is a deficient number, since it is larger than the sum of its proper divisors (15461025817).

1221421033223 is an equidigital number, since it uses as much as digits as its factorization.

1221421033223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15461025816.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 1221421033223 its reverse (3223301241221), we get a palindrome (4444722274444).

The spelling of 1221421033223 in words is "one trillion, two hundred twenty-one billion, four hundred twenty-one million, thirty-three thousand, two hundred twenty-three".