1221130535 has 8 divisors (see below), whose sum is σ = 1466378016. Its totient is φ = 976223520.

The previous prime is 1221130531. The next prime is 1221130549. The reversal of 1221130535 is 5350311221.

It is a happy number.

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

It is not a de Polignac number, because 1221130535 - 2² = 1221130531 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221130535.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221130531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77156 + ... + 91625.

It is an arithmetic number, because the mean of its divisors is an integer number (183297252).

Almost surely, 2^1221130535 is an apocalyptic number.

1221130535 is a deficient number, since it is larger than the sum of its proper divisors (245247481).

1221130535 is a wasteful number, since it uses less digits than its factorization.

1221130535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170233.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 1221130535 is about 34944.6782071319. The cubic root of 1221130535 is about 1068.8596856978.

Adding to 1221130535 its reverse (5350311221), we get a palindrome (6571441756).

The spelling of 1221130535 in words is "one billion, two hundred twenty-one million, one hundred thirty thousand, five hundred thirty-five".