1211233111010 has 32 divisors (see below), whose sum is σ = 2486042263152. Its totient is φ = 420917207040.

The previous prime is 1211233110961. The next prime is 1211233111013. The reversal of 1211233111010 is 101113321121.

It can be written as a sum of positive squares in 8 ways, for example, as 111337670929 + 1099895440081 = 333673^2 + 1048759^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

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 1211233111010.

It is not an unprimeable number, because it can be changed into a prime (1211233111013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274032431 + ... + 274036850.

Almost surely, 2^{1211233111010} is an apocalyptic number.

1211233111010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211233111010 is an abundant number, since it is smaller than the sum of its proper divisors (1274809152142).

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

1211233111010 is a wasteful number, since it uses less digits than its factorization.

1211233111010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548069318.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 1211233111010 its reverse (101113321121), we get a palindrome (1312346432131).

The spelling of 1211233111010 in words is "one trillion, two hundred eleven billion, two hundred thirty-three million, one hundred eleven thousand, ten".