1221123535 has 4 divisors (see below), whose sum is σ = 1465348248. Its totient is φ = 976898824.

The previous prime is 1221123523. The next prime is 1221123557. The reversal of 1221123535 is 5353211221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221123535 - 2⁹ = 1221123023 is a prime.

It is a super-2 number, since 2×1221123535² = 2982285375461792450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122112349 + ... + 122112358.

It is an arithmetic number, because the mean of its divisors is an integer number (366337062).

Almost surely, 2^1221123535 is an apocalyptic number.

1221123535 is a deficient number, since it is larger than the sum of its proper divisors (244224713).

1221123535 is an equidigital number, since it uses as much as digits as its factorization.

1221123535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244224712.

The product of its digits is 1800, while the sum is 25.

The square root of 1221123535 is about 34944.5780486759. The cubic root of 1221123535 is about 1068.8576433193.

Adding to 1221123535 its reverse (5353211221), we get a palindrome (6574334756).

The spelling of 1221123535 in words is "one billion, two hundred twenty-one million, one hundred twenty-three thousand, five hundred thirty-five".