1221450135 has 16 divisors (see below), whose sum is σ = 1960492896. Its totient is φ = 649382528.

The previous prime is 1221450107. The next prime is 1221450173. The reversal of 1221450135 is 5310541221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1221450135 - 2⁵ = 1221450103 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 123684 + ... + 133193.

It is an arithmetic number, because the mean of its divisors is an integer number (122530806).

Almost surely, 2^1221450135 is an apocalyptic number.

1221450135 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1221450135 is a deficient number, since it is larger than the sum of its proper divisors (739042761).

1221450135 is a wasteful number, since it uses less digits than its factorization.

1221450135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257202.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1221450135 is about 34949.2508503401. The cubic root of 1221450135 is about 1068.9529265506.

Adding to 1221450135 its reverse (5310541221), we get a palindrome (6531991356).

The spelling of 1221450135 in words is "one billion, two hundred twenty-one million, four hundred fifty thousand, one hundred thirty-five".