1221678134 has 16 divisors (see below), whose sum is σ = 1868107968. Its totient is φ = 599056392.

The previous prime is 1221678119. The next prime is 1221678137. The reversal of 1221678134 is 4318761221.

It is a junction number, because it is equal to n+sod(n) for n = 1221678094 and 1221678103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221678137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10337 + ... + 50499.

It is an arithmetic number, because the mean of its divisors is an integer number (116756748).

Almost surely, 2^1221678134 is an apocalyptic number.

1221678134 is a deficient number, since it is larger than the sum of its proper divisors (646429834).

1221678134 is a wasteful number, since it uses less digits than its factorization.

1221678134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40459.

The product of its digits is 16128, while the sum is 35.

The square root of 1221678134 is about 34952.5125563242. The cubic root of 1221678134 is about 1069.0194335733.

The spelling of 1221678134 in words is "one billion, two hundred twenty-one million, six hundred seventy-eight thousand, one hundred thirty-four".