1221000012110 has 16 divisors (see below), whose sum is σ = 2198135017296. Its totient is φ = 488325561408.

The previous prime is 1221000012073. The next prime is 1221000012139. The reversal of 1221000012110 is 112100001221.

It is a junction number, because it is equal to n+sod(n) for n = 1221000012091 and 1221000012100.

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 7 ways as a sum of consecutive naturals, for example, 9236519 + ... + 9367778.

It is an arithmetic number, because the mean of its divisors is an integer number (137383438581).

Almost surely, 2^{1221000012110} is an apocalyptic number.

1221000012110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221000012110 is a deficient number, since it is larger than the sum of its proper divisors (977135005186).

1221000012110 is a wasteful number, since it uses less digits than its factorization.

1221000012110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18610867.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1221000012110 its reverse (112100001221), we get a palindrome (1333100013331).

The spelling of 1221000012110 in words is "one trillion, two hundred twenty-one billion, twelve thousand, one hundred ten".