1221181383 has 8 divisors (see below), whose sum is σ = 1724020848. Its totient is φ = 766231424.

The previous prime is 1221181333. The next prime is 1221181397. The reversal of 1221181383 is 3831811221.

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 1221181383 - 2⁸ = 1221181127 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221181383.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221181333) 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, 11972316 + ... + 11972417.

It is an arithmetic number, because the mean of its divisors is an integer number (215502606).

Almost surely, 2^1221181383 is an apocalyptic number.

1221181383 is a deficient number, since it is larger than the sum of its proper divisors (502839465).

1221181383 is a wasteful number, since it uses less digits than its factorization.

1221181383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23944753.

The product of its digits is 2304, while the sum is 30.

The square root of 1221181383 is about 34945.4057495402. The cubic root of 1221181383 is about 1068.8745213006.

The spelling of 1221181383 in words is "one billion, two hundred twenty-one million, one hundred eighty-one thousand, three hundred eighty-three".