1221331235 has 8 divisors (see below), whose sum is σ = 1471171680. Its totient is φ = 973348864.

The previous prime is 1221331219. The next prime is 1221331271. The reversal of 1221331235 is 5321331221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221331235 - 2⁴ = 1221331219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221331235.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 463070 + ... + 465699.

It is an arithmetic number, because the mean of its divisors is an integer number (183896460).

Almost surely, 2^1221331235 is an apocalyptic number.

1221331235 is a deficient number, since it is larger than the sum of its proper divisors (249840445).

1221331235 is an equidigital number, since it uses as much as digits as its factorization.

1221331235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929037.

The product of its digits is 1080, while the sum is 23.

The square root of 1221331235 is about 34947.5497710498. The cubic root of 1221331235 is about 1068.9182402861.

Adding to 1221331235 its reverse (5321331221), we get a palindrome (6542662456).

The spelling of 1221331235 in words is "one billion, two hundred twenty-one million, three hundred thirty-one thousand, two hundred thirty-five".