1217244221378 has 4 divisors (see below), whose sum is σ = 1825866332070. Its totient is φ = 608622110688.

The previous prime is 1217244221371. The next prime is 1217244221381. The reversal of 1217244221378 is 8731224427121.

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

It can be written as a sum of positive squares in only one way, i.e., 1043374402849 + 173869818529 = 1021457^2 + 416977^2 .

It is not an unprimeable number, because it can be changed into a prime (1217244221371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304311055343 + ... + 304311055346.

Almost surely, 2^{1217244221378} is an apocalyptic number.

1217244221378 is a deficient number, since it is larger than the sum of its proper divisors (608622110692).

1217244221378 is an equidigital number, since it uses as much as digits as its factorization.

1217244221378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608622110691.

The product of its digits is 301056, while the sum is 44.

Adding to 1217244221378 its reverse (8731224427121), we get a palindrome (9948468648499).

The spelling of 1217244221378 in words is "one trillion, two hundred seventeen billion, two hundred forty-four million, two hundred twenty-one thousand, three hundred seventy-eight".