1243021130 has 64 divisors (see below), whose sum is σ = 2560390560. Its totient is φ = 430424064.

The previous prime is 1243021111. The next prime is 1243021133. The reversal of 1243021130 is 311203421.

It can be written as a sum of positive squares in 16 ways, for example, as 36084049 + 1206937081 = 6007^2 + 34741^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a junction number, because it is equal to n+sod(n) for n = 1243021099 and 1243021108.

It is not an unprimeable number, because it can be changed into a prime (1243021133) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 743936 + ... + 745604.

Almost surely, 2^1243021130 is an apocalyptic number.

1243021130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1243021130 is an abundant number, since it is smaller than the sum of its proper divisors (1317369430).

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

1243021130 is a wasteful number, since it uses less digits than its factorization.

1243021130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2043.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1243021130 is about 35256.5047898966. The cubic root of 1243021130 is about 1075.2088665728.

Adding to 1243021130 its reverse (311203421), we get a palindrome (1554224551).

The spelling of 1243021130 in words is "one billion, two hundred forty-three million, twenty-one thousand, one hundred thirty".