121221020110 has 64 divisors (see below), whose sum is σ = 232178918400. Its totient is φ = 45438302592.

The previous prime is 121221020093. The next prime is 121221020117. The reversal of 121221020110 is 11020122121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221020117) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14613124 + ... + 14621416.

It is an arithmetic number, because the mean of its divisors is an integer number (3627795600).

Almost surely, 2^121221020110 is an apocalyptic number.

121221020110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121221020110 is a deficient number, since it is larger than the sum of its proper divisors (110957898290).

121221020110 is a wasteful number, since it uses less digits than its factorization.

121221020110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9145.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121221020110 its reverse (11020122121), we get a palindrome (132241142231).

The spelling of 121221020110 in words is "one hundred twenty-one billion, two hundred twenty-one million, twenty thousand, one hundred ten".