1211121210 has 32 divisors (see below), whose sum is σ = 3130283520. Its totient is φ = 298122048.

The previous prime is 1211121209. The next prime is 1211121227. The reversal of 1211121210 is 121211121.

It is a Curzon 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 15 ways as a sum of consecutive naturals, for example, 1552330 + ... + 1553109.

It is an arithmetic number, because the mean of its divisors is an integer number (97821360).

Almost surely, 2^1211121210 is an apocalyptic number.

1211121210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211121210 is an abundant number, since it is smaller than the sum of its proper divisors (1919162310).

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

1211121210 is a wasteful number, since it uses less digits than its factorization.

1211121210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3105462.

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1211121210 is about 34801.1667907845. The cubic root of 1211121210 is about 1065.9312712137.

Adding to 1211121210 its reverse (121211121), we get a palindrome (1332332331).

The spelling of 1211121210 in words is "one billion, two hundred eleven million, one hundred twenty-one thousand, two hundred ten".