1221200100110 has 16 divisors (see below), whose sum is σ = 2229120184032. Its totient is φ = 481600039200.

The previous prime is 1221200100097. The next prime is 1221200100143. The reversal of 1221200100110 is 110010021221.

It is a junction number, because it is equal to n+sod(n) for n = 1221200100091 and 1221200100100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 859999361 + ... + 860000780.

It is an arithmetic number, because the mean of its divisors is an integer number (139320011502).

Almost surely, 2^{1221200100110} is an apocalyptic number.

1221200100110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221200100110 is a deficient number, since it is larger than the sum of its proper divisors (1007920083922).

1221200100110 is a wasteful number, since it uses less digits than its factorization.

1221200100110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720000219.

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

Adding to 1221200100110 its reverse (110010021221), we get a palindrome (1331210121331).

The spelling of 1221200100110 in words is "one trillion, two hundred twenty-one billion, two hundred million, one hundred thousand, one hundred ten".