1221216327 has 12 divisors (see below), whose sum is σ = 1765761400. Its totient is φ = 813321648.

The previous prime is 1221216319. The next prime is 1221216371. The reversal of 1221216327 is 7236121221.

1221216327 is a `hidden beast` number, since 1 + 2 + 2 + 1 + 21 + 632 + 7 = 666.

It is not a de Polignac number, because 1221216327 - 2³ = 1221216319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221216327.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221216527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59077 + ... + 77022.

Almost surely, 2^1221216327 is an apocalyptic number.

1221216327 is a deficient number, since it is larger than the sum of its proper divisors (544545073).

1221216327 is a wasteful number, since it uses less digits than its factorization.

1221216327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137102 (or 137099 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 1221216327 is about 34945.9057258501. The cubic root of 1221216327 is about 1068.8847164541.

Adding to 1221216327 its reverse (7236121221), we get a palindrome (8457337548).

The spelling of 1221216327 in words is "one billion, two hundred twenty-one million, two hundred sixteen thousand, three hundred twenty-seven".