1211111121210 has 64 divisors (see below), whose sum is σ = 3192677406720. Its totient is φ = 292662089280.

The previous prime is 1211111121179. The next prime is 1211111121217. The reversal of 1211111121210 is 121211111121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211111121210.

It is not an unprimeable number, because it can be changed into a prime (1211111121217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46177246 + ... + 46203465.

It is an arithmetic number, because the mean of its divisors is an integer number (49885584480).

Almost surely, 2^{1211111121210} is an apocalyptic number.

1211111121210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211111121210 is an abundant number, since it is smaller than the sum of its proper divisors (1981566285510).

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

1211111121210 is a wasteful number, since it uses less digits than its factorization.

1211111121210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92380763.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1211111121210 its reverse (121211111121), we get a palindrome (1332322232331).

The spelling of 1211111121210 in words is "one trillion, two hundred eleven billion, one hundred eleven million, one hundred twenty-one thousand, two hundred ten".