1211121221110 has 16 divisors (see below), whose sum is σ = 2180037031632. Its totient is φ = 484444303200.

The previous prime is 1211121221077. The next prime is 1211121221111. The reversal of 1211121221110 is 111221211121.

It is a super-2 number, since 2×1211121221110² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211121221111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 868525 + ... + 1782295.

It is an arithmetic number, because the mean of its divisors is an integer number (136252314477).

Almost surely, 2^{1211121221110} is an apocalyptic number.

1211121221110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211121221110 is a deficient number, since it is larger than the sum of its proper divisors (968915810522).

1211121221110 is a wasteful number, since it uses less digits than its factorization.

1211121221110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046319.

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

Adding to 1211121221110 its reverse (111221211121), we get a palindrome (1322342432231).

The spelling of 1211121221110 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred ten".