1211242530 has 32 divisors (see below), whose sum is σ = 2907907200. Its totient is φ = 322895232.

The previous prime is 1211242523. The next prime is 1211242531. The reversal of 1211242530 is 352421121.

It is a junction number, because it is equal to n+sod(n) for n = 1211242497 and 1211242506.

It is not an unprimeable number, because it can be changed into a prime (1211242531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160686 + ... + 168054.

It is an arithmetic number, because the mean of its divisors is an integer number (90872100).

Almost surely, 2^1211242530 is an apocalyptic number.

1211242530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211242530 is an abundant number, since it is smaller than the sum of its proper divisors (1696664670).

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

1211242530 is a wasteful number, since it uses less digits than its factorization.

1211242530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12858.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1211242530 is about 34802.9097921424. The cubic root of 1211242530 is about 1065.9668620539.

Adding to 1211242530 its reverse (352421121), we get a palindrome (1563663651).

The spelling of 1211242530 in words is "one billion, two hundred eleven million, two hundred forty-two thousand, five hundred thirty".