1221004235 has 8 divisors (see below), whose sum is σ = 1598405616. Its totient is φ = 888003040.

The previous prime is 1221004207. The next prime is 1221004237. The reversal of 1221004235 is 5324001221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221004235 - 2¹² = 1221000139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221004237) 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, 11099984 + ... + 11100093.

It is an arithmetic number, because the mean of its divisors is an integer number (199800702).

Almost surely, 2^1221004235 is an apocalyptic number.

1221004235 is a deficient number, since it is larger than the sum of its proper divisors (377401381).

1221004235 is a wasteful number, since it uses less digits than its factorization.

1221004235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22200093.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1221004235 is about 34942.8710182778. The cubic root of 1221004235 is about 1068.8228341549.

Adding to 1221004235 its reverse (5324001221), we get a palindrome (6545005456).

The spelling of 1221004235 in words is "one billion, two hundred twenty-one million, four thousand, two hundred thirty-five".