1211210120 has 16 divisors (see below), whose sum is σ = 2725222860. Its totient is φ = 484484032.

The previous prime is 1211210089. The next prime is 1211210129. The reversal of 1211210120 is 210121121.

It can be written as a sum of positive squares in 2 ways, for example, as 1123188196 + 88021924 = 33514^2 + 9382^2 .

It is not an unprimeable number, because it can be changed into a prime (1211210129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15140087 + ... + 15140166.

Almost surely, 2^1211210120 is an apocalyptic number.

1211210120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211210120 is an abundant number, since it is smaller than the sum of its proper divisors (1514012740).

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

1211210120 is a wasteful number, since it uses less digits than its factorization.

1211210120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30280264 (or 30280260 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1211210120 is about 34802.4441670409. Note that the first 3 decimals coincide. The cubic root of 1211210120 is about 1065.9573543807.

Adding to 1211210120 its reverse (210121121), we get a palindrome (1421331241).

The spelling of 1211210120 in words is "one billion, two hundred eleven million, two hundred ten thousand, one hundred twenty".