1211321030 has 16 divisors (see below), whose sum is σ = 2181096720. Its totient is φ = 484368672.

The previous prime is 1211321021. The next prime is 1211321081. The reversal of 1211321030 is 301231121.

It is a junction number, because it is equal to n+sod(n) for n = 1211320996 and 1211321014.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 14756 + ... + 51384.

It is an arithmetic number, because the mean of its divisors is an integer number (136318545).

Almost surely, 2^1211321030 is an apocalyptic number.

1211321030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211321030 is a deficient number, since it is larger than the sum of its proper divisors (969775690).

1211321030 is a wasteful number, since it uses less digits than its factorization.

1211321030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39943.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1211321030 is about 34804.0375531346. The cubic root of 1211321030 is about 1065.9898898095.

Adding to 1211321030 its reverse (301231121), we get a palindrome (1512552151).

The spelling of 1211321030 in words is "one billion, two hundred eleven million, three hundred twenty-one thousand, thirty".