1321220104 has 8 divisors (see below), whose sum is σ = 2477287710. Its totient is φ = 660610048.

The previous prime is 1321220083. The next prime is 1321220111. The reversal of 1321220104 is 4010221231.

It can be written as a sum of positive squares in only one way, i.e., 1298160900 + 23059204 = 36030^2 + 4802^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82576249 + ... + 82576264.

Almost surely, 2^1321220104 is an apocalyptic number.

It is an amenable number.

1321220104 is a deficient number, since it is larger than the sum of its proper divisors (1156067606).

1321220104 is a wasteful number, since it uses less digits than its factorization.

1321220104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165152519 (or 165152515 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1321220104 is about 36348.5914995341. The cubic root of 1321220104 is about 1097.2991879415.

Adding to 1321220104 its reverse (4010221231), we get a palindrome (5331441335).

The spelling of 1321220104 in words is "one billion, three hundred twenty-one million, two hundred twenty thousand, one hundred four".