1221311212423 has 8 divisors (see below), whose sum is σ = 1221680979792. Its totient is φ = 1220941513536.

The previous prime is 1221311212421. The next prime is 1221311212427. The reversal of 1221311212423 is 3242121131221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221311212423 - 2¹ = 1221311212421 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 (1221311212421) 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, 80199336 + ... + 80214562.

It is an arithmetic number, because the mean of its divisors is an integer number (152710122474).

Almost surely, 2^{1221311212423} is an apocalyptic number.

1221311212423 is a deficient number, since it is larger than the sum of its proper divisors (369767369).

1221311212423 is a wasteful number, since it uses less digits than its factorization.

1221311212423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34241.

The product of its digits is 1152, while the sum is 25.

Adding to 1221311212423 its reverse (3242121131221), we get a palindrome (4463432343644).

The spelling of 1221311212423 in words is "one trillion, two hundred twenty-one billion, three hundred eleven million, two hundred twelve thousand, four hundred twenty-three".