1211211121210 has 8 divisors (see below), whose sum is σ = 2180180018196. Its totient is φ = 484484448480.

The previous prime is 1211211121207. The next prime is 1211211121217. The reversal of 1211211121210 is 121211121121.

It can be written as a sum of positive squares in 2 ways, for example, as 1138623445969 + 72587675241 = 1067063^2 + 269421^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1211211121217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60560556051 + ... + 60560556070.

Almost surely, 2^{1211211121210} is an apocalyptic number.

1211211121210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211211121210 is a deficient number, since it is larger than the sum of its proper divisors (968968896986).

1211211121210 is a wasteful number, since it uses less digits than its factorization.

1211211121210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121121112128.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 1211211121210 its reverse (121211121121), we get a palindrome (1332422242331).

The spelling of 1211211121210 in words is "one trillion, two hundred eleven billion, two hundred eleven million, one hundred twenty-one thousand, two hundred ten".