1221252104 has 8 divisors (see below), whose sum is σ = 2289847710. Its totient is φ = 610626048.

The previous prime is 1221252049. The next prime is 1221252107. The reversal of 1221252104 is 4012521221.

It can be written as a sum of positive squares in only one way, i.e., 1142575204 + 78676900 = 33802^2 + 8870^2 .

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

It is a super-3 number, since 3×1221252104³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221252107) 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, 76328249 + ... + 76328264.

Almost surely, 2^1221252104 is an apocalyptic number.

It is an amenable number.

1221252104 is a deficient number, since it is larger than the sum of its proper divisors (1068595606).

1221252104 is a wasteful number, since it uses less digits than its factorization.

1221252104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152656519 (or 152656515 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1221252104 is about 34946.4176132547. The cubic root of 1221252104 is about 1068.8951544397.

Adding to 1221252104 its reverse (4012521221), we get a palindrome (5233773325).

The spelling of 1221252104 in words is "one billion, two hundred twenty-one million, two hundred fifty-two thousand, one hundred four".