1221404035 has 16 divisors (see below), whose sum is σ = 1502851680. Its totient is φ = 952439040.

The previous prime is 1221404033. The next prime is 1221404057. The reversal of 1221404035 is 5304041221.

It is not a de Polignac number, because 1221404035 - 2¹ = 1221404033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221403997 and 1221404015.

It is not an unprimeable number, because it can be changed into a prime (1221404033) 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 15 ways as a sum of consecutive naturals, for example, 103855 + ... + 115015.

It is an arithmetic number, because the mean of its divisors is an integer number (93928230).

Almost surely, 2^1221404035 is an apocalyptic number.

1221404035 is a deficient number, since it is larger than the sum of its proper divisors (281447645).

1221404035 is a wasteful number, since it uses less digits than its factorization.

1221404035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11718.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 1221404035 is about 34948.5913163893. The cubic root of 1221404035 is about 1068.9394782325.

Adding to 1221404035 its reverse (5304041221), we get a palindrome (6525445256).

The spelling of 1221404035 in words is "one billion, two hundred twenty-one million, four hundred four thousand, thirty-five".