1221021120110 has 16 divisors (see below), whose sum is σ = 2397641472432. Its totient is φ = 444007680000.

The previous prime is 1221021120091. The next prime is 1221021120119. The reversal of 1221021120110 is 110211201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221021120119) 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, 5550095891 + ... + 5550096110.

It is an arithmetic number, because the mean of its divisors is an integer number (149852592027).

Almost surely, 2^{1221021120110} is an apocalyptic number.

1221021120110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221021120110 is a deficient number, since it is larger than the sum of its proper divisors (1176620352322).

1221021120110 is a wasteful number, since it uses less digits than its factorization.

1221021120110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11100192019.

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

Adding to 1221021120110 its reverse (110211201221), we get a palindrome (1331232321331).

The spelling of 1221021120110 in words is "one trillion, two hundred twenty-one billion, twenty-one million, one hundred twenty thousand, one hundred ten".