1221244012423 has 4 divisors (see below), whose sum is σ = 1221258346528. Its totient is φ = 1221229678320.

The previous prime is 1221244012397. The next prime is 1221244012441. The reversal of 1221244012423 is 3242104421221.

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 1221244012423 - 2¹³ = 1221244004231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221244012391 and 1221244012400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221244012463) 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, 7038486 + ... + 7209907.

It is an arithmetic number, because the mean of its divisors is an integer number (305314586632).

Almost surely, 2^{1221244012423} is an apocalyptic number.

1221244012423 is a deficient number, since it is larger than the sum of its proper divisors (14334105).

1221244012423 is an equidigital number, since it uses as much as digits as its factorization.

1221244012423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14334104.

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 1221244012423 its reverse (3242104421221), we get a palindrome (4463348433644).

The spelling of 1221244012423 in words is "one trillion, two hundred twenty-one billion, two hundred forty-four million, twelve thousand, four hundred twenty-three".