1221135355 has 8 divisors (see below), whose sum is σ = 1598577264. Its totient is φ = 888098400.

The previous prime is 1221135329. The next prime is 1221135361. The reversal of 1221135355 is 5535311221.

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

It is not a de Polignac number, because 1221135355 - 2⁵ = 1221135323 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, 11101176 + ... + 11101285.

It is an arithmetic number, because the mean of its divisors is an integer number (199822158).

Almost surely, 2^1221135355 is an apocalyptic number.

1221135355 is a deficient number, since it is larger than the sum of its proper divisors (377441909).

1221135355 is a wasteful number, since it uses less digits than its factorization.

1221135355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22202477.

The product of its digits is 4500, while the sum is 28.

The square root of 1221135355 is about 34944.7471732162. The cubic root of 1221135355 is about 1068.8610920167.

Adding to 1221135355 its reverse (5535311221), we get a palindrome (6756446576).

The spelling of 1221135355 in words is "one billion, two hundred twenty-one million, one hundred thirty-five thousand, three hundred fifty-five".