1227618167221 has 4 divisors (see below), whose sum is σ = 1228070664652. Its totient is φ = 1227165669792.

The previous prime is 1227618167203. The next prime is 1227618167227.

1227618167221 is nontrivially palindromic in base 10.

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

It can be written as a sum of positive squares in 2 ways, for example, as 712648314225 + 514969852996 = 844185^2 + 717614^2 .

It is a cyclic number.

It is not a de Polignac number, because 1227618167221 - 2⁵ = 1227618167189 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 (1227618167227) 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, 226244646 + ... + 226250071.

It is an arithmetic number, because the mean of its divisors is an integer number (307017666163).

Almost surely, 2^{1227618167221} is an apocalyptic number.

It is an amenable number.

1227618167221 is a deficient number, since it is larger than the sum of its proper divisors (452497431).

1227618167221 is an equidigital number, since it uses as much as digits as its factorization.

1227618167221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452497430.

The product of its digits is 225792, while the sum is 46.

The spelling of 1227618167221 in words is "one trillion, two hundred twenty-seven billion, six hundred eighteen million, one hundred sixty-seven thousand, two hundred twenty-one".