1211221020110 has 32 divisors (see below), whose sum is σ = 2250734660352. Its totient is φ = 468816445440.

The previous prime is 1211221020073. The next prime is 1211221020127. The reversal of 1211221020110 is 110201221121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3288782 + ... + 3638478.

It is an arithmetic number, because the mean of its divisors is an integer number (70335458136).

Almost surely, 2^{1211221020110} is an apocalyptic number.

1211221020110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211221020110 is a deficient number, since it is larger than the sum of its proper divisors (1039513640242).

1211221020110 is a wasteful number, since it uses less digits than its factorization.

1211221020110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360908.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1211221020110 its reverse (110201221121), we get a palindrome (1321422241231).

The spelling of 1211221020110 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, twenty thousand, one hundred ten".