1221513333223 has 8 divisors (see below), whose sum is σ = 1229694258816. Its totient is φ = 1213333611000.

The previous prime is 1221513333181. The next prime is 1221513333233. The reversal of 1221513333223 is 3223333151221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221513333223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221513333233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1784328 + ... + 2372098.

It is an arithmetic number, because the mean of its divisors is an integer number (153711782352).

Almost surely, 2^{1221513333223} is an apocalyptic number.

1221513333223 is a deficient number, since it is larger than the sum of its proper divisors (8180925593).

1221513333223 is a wasteful number, since it uses less digits than its factorization.

1221513333223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601685.

The product of its digits is 19440, while the sum is 31.

Adding to 1221513333223 its reverse (3223333151221), we get a palindrome (4444846484444).

The spelling of 1221513333223 in words is "one trillion, two hundred twenty-one billion, five hundred thirteen million, three hundred thirty-three thousand, two hundred twenty-three".