121221211221110 has 96 divisors (see below), whose sum is σ = 295184823829056. Its totient is φ = 34876831968000.

The previous prime is 121221211221109. The next prime is 121221211221119. The reversal of 121221211221110 is 11122112122121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221211221119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 550344941 + ... + 550565160.

It is an arithmetic number, because the mean of its divisors is an integer number (3074841914886).

Almost surely, 2^{121221211221110} is an apocalyptic number.

121221211221110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121221211221110 is an abundant number, since it is smaller than the sum of its proper divisors (173963612607946).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121221211221110 is a wasteful number, since it uses less digits than its factorization.

121221211221110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100910150 (or 1100910139 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 121221211221110 its reverse (11122112122121), we get a palindrome (132343323343231).

The spelling of 121221211221110 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred eleven million, two hundred twenty-one thousand, one hundred ten".