1221130530 has 48 divisors (see below), whose sum is σ = 3176929080. Its totient is φ = 325430784.

The previous prime is 1221130529. The next prime is 1221130531. The reversal of 1221130530 is 350311221.

1221130530 is a `hidden beast` number, since 1 + 2 + 2 + 1 + 130 + 530 = 666.

It is an interprime number because it is at equal distance from previous prime (1221130529) and next prime (1221130531).

It can be written as a sum of positive squares in 4 ways, for example, as 1022912289 + 198218241 = 31983^2 + 14079^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 188424 + ... + 194796.

Almost surely, 2^1221130530 is an apocalyptic number.

1221130530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221130530 is an abundant number, since it is smaller than the sum of its proper divisors (1955798550).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221130530 is a wasteful number, since it uses less digits than its factorization.

1221130530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8515 (or 8512 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 1221130530 is about 34944.6781355903. The cubic root of 1221130530 is about 1068.8596842389.

Adding to 1221130530 its reverse (350311221), we get a palindrome (1571441751).

The spelling of 1221130530 in words is "one billion, two hundred twenty-one million, one hundred thirty thousand, five hundred thirty".