1221303355 has 8 divisors (see below), whose sum is σ = 1465802064. Its totient is φ = 976884000.

The previous prime is 1221303331. The next prime is 1221303371. The reversal of 1221303355 is 5533031221.

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

It is not a de Polignac number, because 1221303355 - 2⁵ = 1221303323 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22080 + ... + 54130.

It is an arithmetic number, because the mean of its divisors is an integer number (183225258).

Almost surely, 2^1221303355 is an apocalyptic number.

1221303355 is a deficient number, since it is larger than the sum of its proper divisors (244498709).

1221303355 is an equidigital number, since it uses as much as digits as its factorization.

1221303355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39677.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 1221303355 is about 34947.1508853011. The cubic root of 1221303355 is about 1068.9101066293.

Adding to 1221303355 its reverse (5533031221), we get a palindrome (6754334576).

The spelling of 1221303355 in words is "one billion, two hundred twenty-one million, three hundred three thousand, three hundred fifty-five".