1221083135 has 32 divisors (see below), whose sum is σ = 1544114880. Its totient is φ = 925747200.

The previous prime is 1221083131. The next prime is 1221083159. The reversal of 1221083135 is 5313801221.

It is a Cunningham number, because it is equal to 34944²-1.

It is not a de Polignac number, because 1221083135 - 2² = 1221083131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221083131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2900225 + ... + 2900645.

It is an arithmetic number, because the mean of its divisors is an integer number (48253590).

Almost surely, 2^1221083135 is an apocalyptic number.

1221083135 is a deficient number, since it is larger than the sum of its proper divisors (323031745).

1221083135 is a wasteful number, since it uses less digits than its factorization.

1221083135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1221083135 is about 34943.9999856914. Note that the first 4 decimals coincide. The cubic root of 1221083135 is about 1068.8458557254.

Adding to 1221083135 its reverse (5313801221), we get a palindrome (6534884356).

The spelling of 1221083135 in words is "one billion, two hundred twenty-one million, eighty-three thousand, one hundred thirty-five".