1221101111110 has 32 divisors (see below), whose sum is σ = 2228259893760. Its totient is φ = 481725664992.

The previous prime is 1221101111093. The next prime is 1221101111207. The reversal of 1221101111110 is 111111011221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135564 + ... + 1568623.

It is an arithmetic number, because the mean of its divisors is an integer number (69633121680).

Almost surely, 2^{1221101111110} is an apocalyptic number.

1221101111110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221101111110 is a deficient number, since it is larger than the sum of its proper divisors (1007158782650).

1221101111110 is a wasteful number, since it uses less digits than its factorization.

1221101111110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1705180.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 1221101111110 its reverse (111111011221), we get a palindrome (1332212122331).

It can be divided in two parts, 122110111 and 1110, that added together give a palindrome (122111221).

The spelling of 1221101111110 in words is "one trillion, two hundred twenty-one billion, one hundred one million, one hundred eleven thousand, one hundred ten".