1221168386 has 4 divisors (see below), whose sum is σ = 1831752582. Its totient is φ = 610584192.

The previous prime is 1221168383. The next prime is 1221168391. The reversal of 1221168386 is 6838611221.

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., 1208883361 + 12285025 = 34769^2 + 3505^2 .

It is not an unprimeable number, because it can be changed into a prime (1221168383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305292095 + ... + 305292098.

Almost surely, 2^1221168386 is an apocalyptic number.

1221168386 is a deficient number, since it is larger than the sum of its proper divisors (610584196).

1221168386 is an equidigital number, since it uses as much as digits as its factorization.

1221168386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610584195.

The product of its digits is 27648, while the sum is 38.

The square root of 1221168386 is about 34945.2197875475. The cubic root of 1221168386 is about 1068.8707292864.

The spelling of 1221168386 in words is "one billion, two hundred twenty-one million, one hundred sixty-eight thousand, three hundred eighty-six".