1211243311110 has 64 divisors (see below), whose sum is σ = 3324857559552. Its totient is φ = 276639764736.

The previous prime is 1211243311097. The next prime is 1211243311121. The reversal of 1211243311110 is 111133421121.

It is a happy number.

It is a super-2 number, since 2×1211243311110² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1978359 + ... + 2517218.

It is an arithmetic number, because the mean of its divisors is an integer number (51950899368).

Almost surely, 2^{1211243311110} is an apocalyptic number.

1211243311110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211243311110 is an abundant number, since it is smaller than the sum of its proper divisors (2113614248442).

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

1211243311110 is a wasteful number, since it uses less digits than its factorization.

1211243311110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4496877.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 1211243311110 its reverse (111133421121), we get a palindrome (1322376732231).

The spelling of 1211243311110 in words is "one trillion, two hundred eleven billion, two hundred forty-three million, three hundred eleven thousand, one hundred ten".