1211321110 has 16 divisors (see below), whose sum is σ = 2183227200. Its totient is φ = 483895296.

The previous prime is 1211321093. The next prime is 1211321123. The reversal of 1211321110 is 111231121.

It is a happy number.

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, 71070 + ... + 86449.

It is an arithmetic number, because the mean of its divisors is an integer number (136451700).

Almost surely, 2^1211321110 is an apocalyptic number.

1211321110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211321110 is a deficient number, since it is larger than the sum of its proper divisors (971906090).

1211321110 is a wasteful number, since it uses less digits than its factorization.

1211321110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158295.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1211321110 is about 34804.0387024265. The cubic root of 1211321110 is about 1065.9899132768.

Adding to 1211321110 its reverse (111231121), we get a palindrome (1322552231).

It can be divided in two parts, 121 and 1321110, that added together give a palindrome (1321231).

The spelling of 1211321110 in words is "one billion, two hundred eleven million, three hundred twenty-one thousand, one hundred ten".